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ECU: Malfunction. Side Effects May Include Attachment

Summary:

A mechanic who only takes the cars that speak to him.
A street racer who only feels grounded when he's falling apart.
In the quiet hours between midnight races and empty asphalt, Mingi keeps returning to the same garage for the silence that wraps around him like worn leather and engine oil. Yunho doesn’t ask questions, fixes what’s broken under the hood, and without a word, touches what’s breaking inside the driver.
Moodboard

Notes:

ECU - [Emotional Control Unit]
(The thoughts are highlighted in italics)
Please note that the story is told in fragments and non-linear snippets of life, most of the scenes in the first-person chapters do not occur strictly day by day. Each chapter exists with its own time gap from the previous one, jumping through the long, hot summer and the slow shift of seasons.
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This is my second big fic (the third one is already in the works and will be released very soon), and I’m really excited to finally share it with you all the way to the end (~ ̄▽ ̄)~
All updates, progress reports, and news will be posted on my Tumblr blog and also this post.
✼ ҉ ✼ ҉ ✼
An Ateez fan-made banner
Time to shift the gear 🐥

Chapter 1: POV: Mingi / Gravity by Default

Summary:

POV Mingi fan-made banner

Chapter Text

The engine is still ticking down when I kill it outside the gates. Two AM and the asphalt hasn’t given up the day’s heat. It pushes back against the soles of my boots like it wants me to remember I’m still on the ground. I don’t like remembering that.
I rest my forehead on the steering wheel for a few minutes. Not because I need it. Just long enough to let the last of the race noise bleed out of my skull. Two hundred and twelve kilometers an hour on a deserted stretch of industrial frontage road, dodging potholes and the occasional abandoned tire. The kind of speed that makes everything else shut the fuck up for a while.
At that speed the body stops belonging to biography. No history, no names, no old cities. Just pressure. Steering correction. Timing. The exact second your hands stop being hands and become input. That’s the part nobody understands when they talk about risk like it’s a death wish. They think speed is about wanting to die. They’ve never felt what it does to the noise. They’ve never had their thoughts cut cleanly enough to miss them when they come back.
Then I get out. The night breeze catches the bare skin of my shoulders, cooling the sweat under the straps of my tank top. The light from the sodium streetlamps reflects off the glossy black paintwork of the doors, highlighting a distinctive matt pattern of horizontal black flame-like stripes that run along both sides, stretching from the rear bumper right up to the hood.
The right gate opens easier than the left, like always. I touch the metal in the same spot I always do. Cool despite the night. My fingers come away with the faintest trace of grease. Good. Means he’s been working.
Inside, the garage is a different planet. Dimmer. Quieter. The air smells like oil and old leather and something wooden. My shoulders drop before I tell them to. I don't fight it. My body decided something about this garage months ago and I've been showing up ever since to pretend I made the decision myself.
There. The first real breath since some local kid dropped his arms to start the run back at the industrial park. It hits the back of my throat like heavy water, coating the raw edges of the adrenaline. My lungs expand, instead of just taking those short, shallow sips of oxygen I live on when I'm behind the wheel weaving through midnight traffic and dodging unlit median strips.
As my eyes adjust to the dimness, I look past the half-shadowed bay and spot him. He’s standing beneath a Civic fully hoisted on the left lift, illuminated by the stark work-light. He’s wearing a simple black t-shirt with a slightly deep V-neck that highlights the sharp line of his collarbones as he tilts his head back. His sleeves are rolled high up his forearms, muscles tense as he reaches up to torque a bolt on the undercarriage. I don’t say anything. He doesn’t either.
I drop onto the crate by the tool chest, legs stretched out, and just watch. My head is still loud from the race, but it’s quieter here. Not silent. Just… dialed down.
I rub my thumb over a callus on my palm and tell myself I came for the car. The left rear camber was pulling a little on the last set of turns. That’s why I’m here. That’s the only reason.
He lowers his wrench, steps out from the heavy shadow of the lift, wipes his hands on a rag that used to be red, and finally looks at me. Dark eyes unreadable in this light. Or maybe I just don’t want to read them.
“Nightjar,” he says.
I nod once. He already knows the car.
He walks around me in a slight arc as he approaches my car. The glossy black paint catches the overhead light, while the matte flame pattern stays dull, almost invisible until the angle shifts. Then he pops the hood. The sound of the prop rod locking into place is sharp in the thick air.
I stay on the crate. The metal is warm from the day. My back finds the familiar dent in the wall behind me. I close my eyes for a second and breathe in.
Oil. Old leather. That faint woody note underneath it all.
I grew up in a house that smelled like nothing. Clean in a way that meant nobody cooked, nobody left anything out, nobody did anything that made a mark. My mother kept it that way on purpose. I used to think that was what adult spaces were supposed to smell like - neutral, maintained, correct. It felt like living inside a sterile gauze pad. If you don't leave a mark, you don't exist. Only when I was about nineteen and was sleeping in the back of a modified hatchback in a parking lot outside Albuquerque did I finally understand the comfort of honest mess, the kind that comes from hands that actually build things instead of just maintaining appearances. That night the desert wind carried sand into every crevice of the car, and for the first time I slept without dreaming of crashing. I didn’t know then that relief could be material. That it could live in dust on a dashboard, in a socket wrench left out overnight, in the smell of engine oil warming after midnight. That some places feel safer not because they are safe, but because they make no claim to purity. Clean things lie. Worn things usually don’t.
I open my eyes. He’s already got the left rear wheel off. The fluorescent strip above him buzzes once and settles. Shadows move across his shoulders and the deep neckline of his shirt when he reaches for the impact gun. Three quick, clean bursts. Three quick, clean bursts. The sound settles something in me that the race speed only numbed.
There's a difference between silence and quiet and I've been working out the exact difference for about three years. I mean, silence is the absence of sound. Quiet is the presence of something that doesn't ask anything from you. You can be in a silent room and still feel like every surface is waiting for you to perform something. And you can be in a room full of noise and feel nothing pushing at you at all. This room is the second kind. I don't have a logical explanation for that. I've tried. There's nothing logically special about this particular garage in this particular block of the industrial district where the street lamps are spaced too far apart and the nearest coffee that isn't from a vending machine is eleven minutes away. Nothing that would explain why the air in here sits differently in my lungs than the air everywhere else.
He straightens, his V-neck shirt shifting and revealing more skin as he rolls his shoulders once, and glances over. “Camber again?”
“Yeah.”
He doesn’t push. Just goes back to work. I watch the way the muscles in his back shift under the thin fabric. The way sweat makes the hair at his nape stick. The precise way his fingers find the right wrench without looking.
He didn't ask why I'm here. He didn't ask the last time either, or the time before that. It's possible he just doesn't care. It's possible he noticed that I don't have a good answer and decided that it wasn't worth the awkwardness. If he asked, the whole fragile structure would collapse into a pile of junk metal. He’d say 'Why are you looking at me like that?' and I'd have to get up and drive until I hit a concrete barrier at two hundred miles an hour just to erase the question.
My pulse is still slower than it should be after a win. The usual post-race static is quieter tonight. Because of the smell. Because of the way the garage wraps around me like it knows exactly how much pressure I can take before I start peeling apart at the seams.
I won tonight by a margin that surprised me. The other guy was good, better than his rep. But somewhere on the second straight, when I hit two-twelve, my head went completely clean. Not just quiet. Gone. And I came out of it faster than I went in, which doesn't make sense except that it always makes sense on the road, where the only thing that exists is what's immediately in front of you and the decisions you're making about it in real time. On the road, there are no other cities. No other years. No morning in a place that smelled like stale beer and hot plastic.
I catch myself staring at the line of his forearm again and immediately look at the rafters instead. It’s the car. You’re here for the car.
He works for maybe twenty minutes before he speaks again. “You’re tight on the left rear. I’ll adjust it. Leave it till morning.”
I should go. I always leave the car and go.
Instead I stay on the crate, legs heavy, the heat of the night pressing in through the open gates. My bare skin feels sensitive to the slight drafts in the room. The city outside is still humming, distant bass from somewhere, tires on warm asphalt, but in here it’s just the occasional clink of metal and the low tick of my cooling engine.
A stray cat slips through the gate, pauses to judge us both with glowing eyes, curls up near the tool chest and closes its eyes with the kind of trust I find personally offensive.
He straightens again, wipes sweat from his brow with the back of his wrist, and looks straight at me for a beat longer than necessary. His eyes drop once to my hands. I realize too late I've been gripping my own knee hard enough to leave crescents in the denim. I loosen my hand too deliberate. He definitely saw. Great. Add that to the growing file of inexplicable behaviors I only seem to exhibit in this building.
I look away first. At the car. At the tools. At the clean rag folded over the edge of the bench that I have never seen him use. At anything that isn’t him.
The quiet returns thicker now. My head keeps trying to fill it with the scream of the engine on the straight, the smell of burning rubber, the moment right before the apex when everything narrows to one single point of decision with no tire walls or safety nets to catch a mistake.
Here, none of that matters. Here, the only decision is whether to keep sitting on this crate until the sun comes up or finally stand up and walk out into the heat again.
I don’t stand up. Just looking at the bolt on the second shelf.
He moves from the rear left to something under the hood. I hear the specific dull knock of the hood prop, then the click of something releasing inside the engine cavity. He doesn't tell me what he's doing. He rarely narrates his work. Most mechanics perform competence out loud. They explain every adjustment like they’re building a case for trust. He just does the work. If I ask, he answers. If I don’t, the sound of the tool is apparently explanation enough.
Outside, the night is +28 and the asphalt still remembers the sun. Inside, something in me is already cooling down, settling, finding the shape of the silence he leaves around me like it was measured for exactly this. Like he built this space, this exact amount of quiet, for the precise dimensions of whatever's wrong with me. I don't know if that's comforting or the most frightening thing I've thought all night.
I close my eyes again just for a minute. The impact gun fires twice more. Clean. Certain. And today for the first time since I crossed the finish line tonight, my head is almost quiet. The iron is cool against my back. The impact gun clicks. He’s here. The car is here. The noise is down to a flatline. I can sleep like this. I can exist like this. Just don't let the sun come up yet. Don't make me leave the room. If I stay still enough, maybe time misses me. Maybe dawn gets caught on the warehouses east of here and never reaches this bay. Maybe he keeps working in the same pool of light, saying nothing, and I keep breathing this air. Maybe that’s all this is. A room. A mechanic. A car cooling in the dark. Maybe that should be enough to make it harmless.
I keep my eyes closed and listen to metal answer his hands. Somewhere near the tool chest, the cat resettles with a soft thump. He moves to the other side of the engine bay. Fabric drags over skin. A wrench turns. And because my head is finally almost, almost still, one clear thought rises where all the noise used to be: if he told me to leave right now, I would. If he asked me to stay, I’m not sure I could do anything else.