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Rule number five

Summary:

Sol needed a place to stay.
Sunjae needed a roommate.
Her friend had the perfect solution.

“Mutual friend’s acquaintance needs a roommate.”

“Name?”

“Ryu Sunjae.”

One apartment.
Two roommates.
10 rules.
And one rule they absolutely, definitely couldn’t break:

Rule #5: No dating each other.

Too bad the attraction started long before either of them realized it.

Chapter 1: New Roommate

Notes:

(See the end of the chapter for notes.)

Chapter Text

The first thing Im Sol registered was the muffled, frantic buzzing of her phone somewhere under the pillow, like a trapped insect fighting for its life.

The second was the sharp crack of plastic hitting the floor when she flailed for it and sent the whole thing flying.

She groaned, rolled onto her stomach, and pressed her face into the mattress. The sheets still carried the faint, powdery scent of the detergent she always bought from the corner convenience store — clean, slightly floral, already fading.

Outside the window, early Seoul breathed: the low rumble of delivery scooters, the distant hiss of a bus braking, the soft metallic clink of a bicycle chain somewhere down the quiet side street. Inside, her brain was still buffering, thick and slow.

Then the glowing numbers on the cracked screen registered.

Moving day.

Sol sat up so fast the room spun. Blood rushed in her ears. Her tiny one-room apartment looked like a crime scene staged by someone who had given up halfway through the job. Boxes leaned against every wall like exhausted soldiers. A pair of jeans hung from the lampshade, one leg dangling like a defeated flag. An open box on the floor held three unmatched socks, a single frayed charger cable, and — sitting proudly in the exact center — one lonely metal spoon, catching the weak morning light.

She stared at it.

“Why did I pack a spoon?”

The answer arrived a second later, soft and self-loathing, tasting like last night’s instant coffee.

“Because I’m an idiot.”

Her phone rang. Hyun-joo’s name lit up the cracked screen.

Sol answered on the third ring, voice still thick with sleep, tongue sticking slightly to the roof of her mouth.

“You’re awake, right?”

Sol squinted at the clock. 7:12 a.m. The numbers looked personally offended by her existence.

“Define awake.”

“Sol.”

“I’m conscious.”

“Your moving truck is coming in an hour.”

Sol looked around the apocalypse that used to be her living room. Nothing was labeled. Half the boxes were still empty, their cardboard flaps yawning open like tired mouths. The other half contained things she no longer recognized — a single mitten, a half-used bottle of lotion that smelled faintly of green apple, a notebook with only three pages written in.

“I have a system.”

“Your system is putting everything into boxes without labeling them.”

“Exactly. It’s called mystery. People pay money for that kind of experience.”

Hyun-joo made a sound that was half laugh, half threat. “You’re not funny when you’re late. Get up. And don’t forget the deposit money.”

Sol dragged herself out of bed. The floor was cool under her bare feet, slightly dusty. She nearly tripped over a pile of clothes that had somehow migrated overnight, the fabric soft and wrinkled against her ankles.

In the bathroom she brushed her teeth with the urgency of someone already losing the morning. The mint burned sharp and clean on her tongue. She threw on the first clean shirt she found — soft cotton, slightly wrinkled, still carrying the faint scent of that same floral detergent. Good enough.

While she shoved random items into the remaining boxes, the tape gun making a harsh, sticky rrrip every time she sealed something, Hyun-joo stayed on the phone, talking in that efficient, slightly judgmental tone only best friends were allowed.

“You’re not running from anything dramatic, right? No secret heartbreak? No sudden career crisis?”

“Rent went up,” Sol said, the tape gun snapping shut. “And Minji moved back to Busan. I can’t afford this place alone unless I start selling plasma every weekend. Which I’m not ready for. Yet.”

“Good. Because I found you something. Mutual friend’s acquaintance needs a roommate. Second bedroom. Nice building on a quiet street near Hongdae, but not right in the middle of the chaos. Walking distance to the station. Trees. Actual sunlight.”

Sol paused with a roll of tape in her hand. The adhesive felt slightly sticky against her fingertips. “Name?”

“Ryu Sunjae.”

The name landed with a small, unexpected weight, like a stone dropped into still water. Sol had heard it before — music shows flickering on late-night televisions, short clips that floated across her feed, that one song that seemed to play in every café near the university last autumn, soft and a little melancholic. She didn’t know the details.

She just knew the general shape of the information: musician, rising, the kind of face people took screenshots of and never deleted.

“He’s looking for someone responsible,” Hyun-joo continued.

“I’m responsible.”

“When you’re awake.”

“Take it back.”

Hyun-joo laughed. “Just meet him. The rent is reasonable. And he seems… organized. You’ll either love him or kill him. Either way, it’s progress.”

Sol ended the call, stared at the spoon one last time — the metal cool and smooth under her fingertips — and dropped it into a box labeled IMPORTANT with zero irony.

 

—-

 

By the time the small moving truck arrived, Sol had achieved a state of controlled chaos. She rode in the passenger seat, holding a convenience-store coffee in one hand and her dignity in the other.

The coffee was already half-spilled on the plastic lid, the bitter, slightly burnt smell rising every time the truck hit a bump. Dignity was not doing better.

The new building sat on a quiet side street lined with ginkgo trees whose leaves had already begun turning gold at the edges, catching the soft morning light like tiny coins.

The air smelled faintly of damp earth and the distant sweetness of roasted sweet potatoes from a street cart somewhere nearby. Clean lobby. Working elevator that didn’t smell like someone else’s kimchi stew.

No mysterious stains in the hallway. She stopped in front of the apartment door, arms full of two boxes, her bag slipping off one shoulder, coffee balanced precariously. The cardboard edges dug into her palms.

She knocked with her elbow.

The door opened.

And the world did that stupid thing where time slowed down for half a second, as if the hallway itself was holding its breath.

Ryu Sunjae stood there in a plain black T-shirt and loose gray sweatpants, one cardboard box held easily against his hip. Tall. Broad through the shoulders. The kind of hands that looked like they knew how to do things carefully — long fingers, faintly calloused at the tips. His hair was slightly messy, dark strands falling across his forehead like he had been moving things around all morning. His face was… unfair. Sharp jaw, quiet eyes the color of strong tea, the faint shadow of someone who had not bothered with a full night’s sleep.

The air that drifted out of the apartment smelled clean — soap, laundry detergent, and something warmer underneath, like cedar or old wood.

Sol’s brain helpfully catalogued all of it before her mouth remembered how language worked.

She stopped.

He stopped.

Neither of them spoke. Somewhere down the hallway a door closed softly. The silence between them felt almost physical.

Sol realized she was staring and forced her face into something resembling normal human interaction. Her pulse had decided to climb into her throat.

“Hi.”

Sunjae’s gaze flicked over her — messy hair, overloaded arms, coffee threatening to escape — and something almost like amusement passed through his eyes, quiet and quick.

“Hi.”

Silence stretched, thin and taut. Sol adjusted her grip on the boxes; the cardboard rasped against her skin. She tried again.

“I’m Im Sol.”

“Ryu Sunjae.”

“I know.”

One of his eyebrows lifted, just slightly. “You do?”

“You’re… famous.”

“Not really.”

“My friend said you’re famous.”

“Your friend exaggerates.”

“Good,” Sol said, shifting the boxes higher. The coffee lid made a soft plastic click. “I was worried I’d have to pretend I listen to your music.”

He laughed. It was short and low and unexpectedly warm, the sound settling somewhere under her ribs and staying there, like a small coal. The first spark. Quiet. Dangerous.

 

—-

 

Sunjae took one of the boxes from her without asking. Their fingers brushed for half a second — warm skin, calloused tips, the faint scent of clean soap and that woody note underneath. The contact felt like a static shock that traveled straight up her arm. Sol pulled back immediately, the absence of his skin somehow louder than the touch itself.

“Sorry,” she said. Her voice came out thinner than she wanted.

“It’s fine.”

She followed him inside, telling herself the weird little flutter in her stomach was just caffeine and residual panic. Nothing else.

The apartment was bright. High windows let in the soft, gold-edged morning light of Seoul, painting long rectangles across the pale wooden floors. The air smelled clean and slightly cool, like a place that had been carefully kept. Sunjae set the box down near the hallway; the cardboard made a soft thump.

“Your room is the second one. Bathroom is shared. Kitchen’s open. Living room is… living room.”

Sol walked through slowly, taking it in. The light. The quiet. The absence of neighbor arguments through thin walls. Her footsteps sounded too loud on the polished floor. She already liked it more than she wanted to admit — the way the space seemed to hold its breath and wait for her.

Then she reached the bathroom.

One door. One white sink with a faint water stain near the faucet. One glass-walled shower that still held the ghost of steam from earlier. One of everything.

She turned around slowly. The bathroom tiles were cool under her socks.

“We share this?”

Sunjae stood in the hallway, arms crossed loosely, the black fabric of his T-shirt pulling slightly across his shoulders. “Yes.”

“We’re adults.”

“…Yes?”

“Good.” She nodded once, very seriously. “Just making sure.”

He looked at her like he was trying to decide whether she was joking. Sol kept her face perfectly straight.

Inside, she was already inventing a schedule for morning showers and mentally preparing for the day one of them walked in on the other by accident — the imagined heat of steam, the startled silence, the way skin might look under fluorescent light. The thought was both horrifying and, annoyingly, a little interesting.

She filed that thought under Things To Never Examine.

 

—-

 

They settled into an awkward rhythm of unloading. Sunjae moved with the calm efficiency of someone who actually planned his packing — boxes stacked neatly, labels facing outward.

Sol moved like a person who had labeled half her boxes with question marks and pure hope. The sound of tape tearing, cardboard sliding, the occasional soft grunt of effort filled the apartment.

At one point he appeared beside her with a thin folder. The paper was cool and smooth when she took it.

“I printed a roommate agreement.”

Sol expected something basic. What she found was a neatly formatted list that looked like it had been written by a very polite lawyer with mild trust issues. The ink was sharp and black against the white paper.

No leaving dishes overnight.

No loud music after midnight.

No stealing food.

No bringing strangers home without at least a text warning.

No borrowing clothes.

No entering the other person’s room without permission.

She looked up at him. The light from the window caught the edge of his jaw.

“Did you write this?”

“Yes.”

“Are you eighty?”

“I like rules.”

“I can tell.”

She kept reading. Near the bottom, Rule #5 sat in clean black text, somehow heavier than the others:

No dating each other.

Sol blinked. Then she smiled, slow and a little wicked. The paper felt suddenly warmer between her fingers.

“This seems unnecessary.”

Sunjae’s expression didn’t change, but something in his posture sharpened — a subtle tightening of the shoulders, a stillness that felt deliberate. “Why?”

“Because we’re roommates.”

“Exactly.”

“So why put it in writing?”

“Because it’s better to be clear.”

Sol tapped the paper with one finger. The sound was soft, almost intimate in the quiet apartment. “Don’t worry. You’re safe.”

He raised an eyebrow. “Safe?”

“I’m not going to fall for you.”

A beat of silence. The city murmured faintly outside the windows. Then Sunjae said, quietly, “Good.”

They signed. Sol’s signature was messy, the pen dragging slightly on the paper. His was neat, controlled. Neither of them looked at the other while the ink dried.

The air between them felt thicker somehow, charged with the quiet awareness that words on a page did not always mean what people hoped they would.

Sol told herself the little twist in her chest was just amusement. Nothing more.

 

—-

 

 

They were halfway through unpacking the living room when Sunjae’s phone rang. He answered it with a soft “Yeah?” and walked a few steps toward the kitchen. The sound of his voice floated back, lower than usual.

Sol did not mean to listen. She was genuinely trying to figure out how a lamp had ended up in a box labeled Kitchen Utensils.

The shade still smelled faintly of cardboard and dust. But the voice on the other end carried easily in the quiet apartment — warm, familiar, the kind of tone people used when they already knew someone’s schedule, soft and a little intimate.

“Sunjae, are you coming tonight?”

Sol’s hands stilled on the lamp. The metal base was cool against her palms.

Sunjae’s voice softened in a way she hadn’t heard yet. “I’ll be there.”

“Don’t forget what I asked you to bring.”

“I didn’t forget.”

Sol suddenly became extremely interested in the lamp. She turned it over in her hands like it held the secrets of the universe.

The base was smooth and slightly cold. The shade smelled of cardboard and the faint ghost of someone else’s apartment.

When she glanced up, Sunjae was watching her, phone still to his ear. The light from the window caught the dark of his eyes.

“What?” he asked after he hung up. The phone made a soft click as he set it down.

“Nothing.”

“You were staring.”

“I wasn’t.”

“You were.”

“I was looking at the lamp.”

He glanced behind himself. The lamp was currently sitting on the floor between them. Slightly to his left. Not behind him.

“The lamp is behind me,” he said. There was the faintest curl of amusement at the corner of his mouth.

“Exactly,” Sol replied, as if that settled everything.

The smile that tugged at his lips was small and knowing, and she hated how much she noticed it — the way it softened the sharp line of his jaw, the way it made something low in her stomach tighten.

 

—-

 

By evening the apartment looked less like a storage unit and more like a place two strangers might eventually live in. The golden light of late afternoon had softened into the cooler blue of early night.

They ordered takeout — spicy fried chicken and cold noodles from a place two blocks away. The smell of chili oil and sesame filled the living room, sharp and mouth-watering.

They sat on opposite ends of the couch with the containers between them like a temporary demilitarized zone. The cushions were soft, slightly cool against the backs of her thighs.

Conversation started carefully. Then it didn’t.

They argued about the best late-night convenience store snacks — triangle kimbap versus hotteok, the exact right level of sweetness in banana milk.

They discovered they both hated the same overrated drama from last year. Sunjae made a dry comment about the way Sol had labeled her boxes (“Mystery is not a filing system”) and Sol nearly choked on her drink laughing.

It was the kind of laugh that came from the stomach — loud, unguarded, a little embarrassing. Her eyes watered. She wiped them with the back of her hand and found Sunjae watching her.

Not smiling exactly. Just… looking. The city lights outside the windows turned soft and gold, painting faint patterns across the floor. Somewhere down the street a delivery scooter hummed past, the sound rising and falling like a distant wave.

“What?” she asked. Her voice still held the leftover warmth of laughter.

“Nothing.”

“You’re staring.”

“You were laughing.”

“So?”

“Nothing.”

Now she was the one who couldn’t look away. The air between them felt thicker somehow, charged with the quiet awareness that neither of them was quite as indifferent as they were pretending to be.

She could still taste the spice of the chicken on her tongue, the cool slip of the noodles. She could still feel the faint residual heat of his gaze like a hand against her skin.

Hours passed without either of them noticing. The apartment grew warmer. The containers emptied.

The conversation wound itself into something easier, almost comfortable, and under it ran a thin, bright thread of tension neither of them named.

 

—-

 

Later, Sol was carrying a final box toward her bedroom when her sock slipped on the polished floor. The wood was smooth and cool and suddenly treacherous. She pitched forward with a startled sound, the box tilting dangerously.

Sunjae caught her by the waist.

It was only for a second.

But they were suddenly close. His hand was firm at her side, fingers spread against the thin fabric of her shirt, the heat of his palm seeping through the cotton like a brand. Her own palm had landed flat against his chest. She could feel the steady, strong beat of his heart under her hand and the faint warmth of his skin through the soft black T-shirt. The woody, clean scent of him wrapped around her — soap, laundry, and something warmer that was just him. Her pulse was suddenly too loud in her ears, a frantic drum against her ribs.

Silence stretched, thick and electric. She could feel the rise and fall of his breathing. She could see the dark fringe of his lashes, the faint shadow of stubble along his jaw. The apartment around them seemed to hold its breath.

Sol’s throat tightened.

“I’m fine.”

He let go immediately, stepping back like the contact had burned. The absence of his hand left a cool, tingling imprint on her skin.

“Sorry.”

“No, it’s okay.”

She walked the rest of the way to her room without looking at him, the box clutched tight against her chest. She closed the door carefully — the soft click of the latch sounded too loud — and leaned against it.

The wood was cool against her forehead and the back of her neck. Her heart was still hammering, a wild, uneven rhythm. She pressed her palms flat against the door and whispered to the empty room, the words barely more than breath,

“He’s my roommate.”

Across the apartment, Sunjae stood in the hallway a moment longer, staring at the hand that had just held her. He flexed his fingers once, as if testing the lingering warmth, then shook his head like he could physically clear the thought.

She’s just my roommate.

 

—-

 

That night Sol lay in the unfamiliar bed. The sheets were crisp and cool against her bare legs, still carrying the faint, clean scent of someone else’s laundry detergent.

She listened to the soft sounds of another person existing in the same space — the quiet opening of a fridge, the low creak of a floorboard, the distant city breathing outside the window in a low, continuous hush of traffic and night wind through the ginkgo leaves. She smiled into the dark without meaning to. The smile felt private and a little dangerous.

Then she remembered Rule #5.

No dating each other.

She laughed quietly under her breath, the sound soft against the pillow.

“Obviously.”

Across the apartment, Sunjae lay awake too. He thought about the way her eyes had crinkled when she laughed, the bright, unguarded sound of it. He thought about the brief, accidental press of her body against his — the warmth of her, the soft give of her waist under his hand, the way her breath had caught. He closed his eyes and told himself the same thing she had.

She’s just my roommate.

The next morning they discovered they had accidentally switched phone chargers during the unpacking chaos.

They stood in the kitchen arguing about whose was whose, both of them still half-asleep, hair messy, voices low and rough with sleep.

The morning light poured through the windows in pale gold bars.

The air smelled of coffee and the faint residual spice of last night’s takeout.

Neither of them mentioned the night before, but the awareness of it sat between them like a third presence — quiet, electric, impossible to ignore.

And that was how their life together began.

Neither of them knew it yet, but the first rule they would break wasn’t the one about dating.

It was the one about falling.

Notes:

Waahh, I’m just so excited to finally share this idea that’s been living rent-free in my head! 😂 ❤️

I’ve actually never experienced having a roommate, so I had way too much fun imagining. 😂

Have you ever had a roommate before? Hehe.
And be honest… did you have rules? 🤭