Chapter 5: Na Baek-Jin X F!Reader
Chapter 5 Lines You Canât See
Word Count: 2,994
Saturday
The apartment was quiet, but not the peaceful kind. It was the sort of silence that pressed in from all sides, thick and unmoving, making even the smallest sounds feel out of place. The low hum of the TV filled the space, some late night reruns flickering across the screen and casting dull, shifting colors against the walls.
Your notebook lay open in front of you, pen resting loosely between your fingers. The same sentence had been highlighted three times, each stroke slightly darker than the last where your focus had slipped. You stared at it, eyes unmoving, but not a single word registered.
Your pen tapped once against the page. Then again. Then it stilled.
Donât let your guard down here.
Your grip tightened slightly at the memory. Baek Jinâs voice hadnât been loud, but it lingered anyway, low, steady, deliberate in a way that made it impossible to ignore. It hadnât sounded like a joke, and it definitely hadnât sounded like nothing.
Leaning back in your chair, you let out a slow breath and dragged a hand down your face, fingers pressing briefly against your eyes as if that might clear your thoughts. It didnât. The question kept circling, sharp and insistent.
What was that supposed to mean?
A warning. A threat. Or something worse. Something that didnât quite fit him at all.
Concern.
Your jaw tightened at the thought, dismissing it almost immediately.
âYou donât get to live in my head,â you muttered under your breath, your voice quieter than the TV but sharper than the silence.
The pen slipped from your fingers, clattering lightly against the notebook. You stared at it for a moment before snapping the notebook shut with more force than necessary. The sound echoed faintly in the small apartment, final in a way that made it clear you were done trying.
You pushed your chair back and stood, the legs scraping softly against the floor. Hoodie, wallet, keys. You grabbed them without much thought, movements quick and almost impatient. You didnât bother turning off the TV.
You just needed air.
The convenience store door chimed as you stepped inside, the familiar sound barely registering. Fluorescent lights buzzed overhead, casting everything in a pale, artificial glow. The cashier stood behind the counter, slouched and half focused on his phone, barely glancing up as you walked in.
Nothing had changed. It should have felt normal.
It didnât.
You moved through the aisles without really looking, your hand brushing past rows of drinks before grabbing one at random from the fridge. The cold bit instantly into your fingers, grounding in a way your thoughts werenât. At the counter, the cashier mumbled a quiet greeting, and you responded with something equally absent as coins exchanged hands.
Routine. Simple. Safe.
You stepped back outside.
The air was cooler now, the sky caught in that in between state where the last traces of daylight faded into a dull blue gray. Streetlights flickered to life one by one, casting long shadows across the pavement. You walked without a destination, letting your feet carry you forward while your thoughts drifted elsewhere.
For a while, it was quiet. Just the distant hum of passing cars and the faint rustle of wind between buildings. Your footsteps echoed softly, steady and unhurried, the condensation from your drink dampening your fingers.
Then something shifted.
It was subtle enough that you could have ignored it. A faint prickle at the back of your neck, the kind of instinct you learned not to dismiss. You didnât react immediately. You didnât slow, didnât turn. You just kept walking, your senses sharpening without outward sign.
A few steps later, you heard it.
Footsteps.
Not loud, not rushed, but there. Just behind you, matching your pace a little too closely.
You slowed slightly.
They slowed with you.
Your gaze shifted just enough to catch the reflection in a darkened storefront window.
Across the street, a figure moved in parallel. His head was angled downward, obscuring his face, hands tucked into his pockets in a way that looked casual at a glance but felt anything but.
He wasnât just walking.
He was watching.
You looked away like you hadnât noticed and turned the corner, adjusting your pace just enough to test him. A few seconds passed before he appeared again. Same distance. Same rhythm.
Your grip tightened slightly around the bottle in your hand.
Not a coincidence.
You crossed the street without warning, cutting through a gap in traffic. From the corner of your eye, you saw him follow without hesitation. You slowed near a vending machine, pretending to check your phone while using the reflection to keep track of him. He stopped near a lamppost, close enough to confirm what you already knew.
Consistent. Intentional. Watching.
Your patience snapped.
You turned sharply, your gaze locking onto where he stood.
âAre you going to keep following me,â you said flatly, your voice cutting clean through the quiet street, âor do you actually want something?â
Silence answered you.
No movement. No reply.
Your eyes narrowed, scanning the spot he had occupied.
Empty.
You blinked once, your gaze flicking to either side. Nothing. No retreating footsteps, no figure slipping away. He hadnât run. He hadnât reacted.
He had simply disappeared.
A slow breath left your lungs as your grip tightened around the bottle, the plastic creaking faintly under the pressure.
âUnion,â you muttered under your breath, more irritated than shaken.
Of course it was.
âTalking to yourself now, rookie?â
You turned at the voice, already familiar enough to recognize instantly. Baku leaned casually against the wall a few feet away, arms crossed and grin firmly in place like he had been watching longer than he let on. Gotak stood nearby, quieter, his gaze already scanning over you as if checking for something you werenât saying.
You exhaled through your nose. âYou always show up at the worst times?â
âThe best times,â Baku corrected easily, pushing himself off the wall. âYou just donât appreciate it yet.â
âI was busy.â
âYeah?â His eyes flicked briefly down the street behind you before returning to your face. âLooked like you were about to start an argument with the air.â
You didnât respond, and the silence said enough.
Gotak stepped a little closer, his expression softer but no less focused. âYou okay?â
âIâm fine.â
It came out too quickly, and you knew it the second the words left your mouth.
Baku caught it. His grin faltered for just a fraction of a second before settling back into place, but this time, he didnât push. Instead, he clapped his hands once, as if shaking off the moment.
âGood,â he said. âThen youâre free.â
You frowned slightly. âFree for what?â
âKaraoke.â
âNo.â
âYes.â
âI didnât agree to that.â
âYou donât have to,â he said, already turning away like the conversation was finished. âI decided for you.â
You stared at his back for a second before glancing at Gotak. He gave a small shrug, but his eyes held something quieter.
An unspoken invitation.
You hesitated, then sighed.
âThis isnât a habit.â
Baku laughed. âToo late. It already is.â
And despite yourself, you followed.
The karaoke room hit you all at once. Noise, light, heat. Music blasted through cheap speakers, bass vibrating faintly beneath your feet as neon lights flickered along the walls in uneven pulses. The air felt warmer inside, heavier, filled with overlapping voices and the faint scent of snacks and soda.
Baku already had the mic.
Of course he did.
âI donât care,â he shouted, completely off key, his voice cracking as he missed the note.
You winced slightly as you stepped further inside.
Jun tae lit up the moment he saw you, nearly knocking something over as he reached for a bag beside him. âOh, hey. I got extra snacks. Just in case.â
He held them out carefully, like it mattered more than it should.
You took one. âThanks.â
Relief washed over his face instantly.
Gotak dropped into the seat beside you, close enough to feel grounding without saying a word. Si eun sat in the corner, quiet as ever, his gaze already fixed on you with that same calculating stillness.
For a moment, it felt almost normal. Baku yelling into the mic, Jun tae fumbling through song selections, Gotak leaning back like nothing in the world could touch him.
You almost relaxed.
Almost.
âYouâre distracted.â
Your eyes lifted to Si eun, who hadnât moved but was watching you with quiet certainty.
âAm I?â you replied lightly.
âYes.â
Gotak shifted slightly beside you. âSomething happen?â
You hesitated, the noise of the room dulling at the edges.
âSomeone was following me.â
The change was immediate. Baku lowered the mic, the music continuing faintly in the background. Gotak straightened, his posture tightening, while Jun tae fell silent. Si eunâs gaze sharpened just slightly.
âUnion?â he asked.
âMost likely.â
A pause followed, heavy enough to settle over the room.
âTheyâre getting bold,â Baku muttered.
âOr careful,â Si eun countered.
âDid they say anything?â Gotak asked.
âNo.â
âGet close?â
âNo.â
âThen they werenât there to act,â Si eun said. âJust observe.â
You crossed your arms slightly. âThat supposed to make me feel better?â
âIt means theyâre deciding something,â he replied.
You let out a short breath. âYeah. Thatâs worse.â
âYeah,â Gotak agreed quietly.
Silence stretched, thicker now.
Then Si eun spoke again.
âWhat exactly is your connection to Baek Jin?â
The room stilled completely.
Your fingers tightened slightly against your sleeve. âWe sit next to each other. Thatâs it.â
Gotak didnât look convinced. âYou donât get followed for sitting next to someone.â
âI didnât ask to be followed.â
âThatâs not what I said.â
âThen what are you saying?â
His jaw tightened, but it was Si eun who answered.
âYouâre already involved.â
The words landed heavier than anything else had.
You exhaled sharply. âAnd whose fault is that?â
No one answered.
Because they all knew.
âEnough.â
Bakuâs voice cut through the tension, firm and grounding. He wasnât looking at you. He was looking at them.
âShe said she didnât ask for it.â
Si eun didnât argue, but he didnât back down either. âNeither did we.â
That hit harder than it should have.
The room felt smaller suddenly, the air heavier. You looked at them. Really looked this time. At Gotak, guarded now. At Jun tae, quieter, uncertain. At Si eun, already thinking ahead. At Baku, trying to hold things together.
Your chest tightened.
âI didnât ask for any of this,â you said again, softer this time.
No one disagreed.
That was the worst part.
You stood, the movement drawing more attention than you wanted.
âI should go.â
The words slipped out before you could stop them. Gotak shifted like he might say something, but whatever it was, he swallowed it.
You grabbed your things, the noise of the room rushing back in all at once.
And without looking back, you walked out.
The door shut behind you with a dull click, and the noise from the karaoke room cut off almost instantly.
The silence that followed felt louder.
For a moment, you stood there in the hallway, unmoving, the faint hum of overhead lights buzzing softly above you. The air was cooler out here, thinner somehow, like it didnât press against your skin the way it had inside.
It should have felt better.
It didnât.
You exhaled slowly, rolling your shoulders once as if you could physically shake off the weight that had settled there, but it clung stubbornly, unmoved. Your grip tightened slightly around your phone as you started forward, your steps steady but just a little too fast to be casual.
The hallway stretched ahead, empty, fluorescent lights flickering just enough to cast uneven shadows along the walls.
I didnât ask for any of this.
The words echoed back in your head, quieter now, but heavier.
Neither did we.
Your jaw clenched at the memory, the response cutting sharper the second time around. You pushed it away almost immediately, like it didnât belong there.
It wasnât your problem.
It couldnât be.
You reached the stairs and took them without slowing, the rhythm of your footsteps sharp against the concrete. Each step grounded you, steady and controlled.
By the time you pushed the exit door open, the night air hit you all at once, cool and sharp, carrying the distant sounds of traffic and muffled voices from somewhere down the street. You stepped outside, letting the door swing shut behind you.
For a second, you just stood there, breathing.
The neon glow from the karaoke sign painted the pavement in uneven streaks of red and blue, the colors bleeding into each other at your feet.
It should have felt the same as earlier.
It didnât.
Your chest felt tight, the sensation irritating in its persistence.
Annoying.
Unnecessary.
You shifted your weight and shoved your free hand into your hoodie pocket, starting forward again without direction.
Youâre already involved.
Your steps slowed slightly.
âNo, Iâm not,â you muttered under your breath.
A couple passed by, glancing at you briefly before continuing on, but you didnât notice.
âIâm not part of anything.â
The words sounded right.
They should have felt right.
So why didnât they?
Your pace picked up again, frustration settling beneath your skin like something restless, something with nowhere to go. You werenât angry at them. Not really.
It was the way they had looked at you.
Careful.
Measured.
Like you were already standing on one side of a line you hadnât agreed to cross.
Your fingers curled slightly in your pocket.
And worse.
They werenât wrong.
The thought slipped in before you could stop it.
Your jaw tightened immediately, forcing it back down.
It didnât matter.
None of it did.
You just needed to stay out of it. Keep your head down. Get through school.
That was it.
That had always been it.
But Baek Jinâs voice surfaced again, uninvited, cutting clean through everything else.
Donât let your guard down here.
Your steps faltered for half a second before you forced them forward again.
âYouâre all the same,â you muttered, though you werenât entirely sure who you meant anymore.
The Union. Eunjang. Him.
It all blurred together in a way you didnât like, lines overlapping where they shouldnât.
You didnât do this.
You didnât do attachments. Didnât do sides.
You knew better.
You had learned better.
And yet.
Your grip tightened slightly around your phone.
Gotakâs voice from the night before lingered faintly in your mind, steady and grounding in a way that made something twist uncomfortably in your chest.
Youâre not alone.
You exhaled sharply.
âYeah,â you muttered. âThatâs the problem.â
You kept walking.
Didnât look back.
Didnât slow down.
From across the street, Baek Jin watched you walk away.
He stood just beyond the reach of the streetlight, shadow cutting clean across his figure so that only the faint edge of his profile caught the glow. To anyone passing by, he was forgettable. Just another student lingering too long outside.
But his gaze was anything but.
It followed you with quiet precision, tracking the set of your shoulders, the tension in your stride, the way your pace held just a fraction too fast to be aimless.
You didnât look back.
You didnât hesitate.
Whatever had happened inside, you carried it with you.
You just refused to let it show.
That, more than anything, held his attention.
For a moment, he said nothing. The distant hum of traffic filled the silence, punctuated by the occasional burst of laughter spilling faintly from the karaoke building behind him.
None of it reached him.
âShe left.â
The voice came from just behind him, low and careful.
Baek Jin didnât turn. âI can see that.â
A brief pause followed.
âDo you want us to keep watching her?â
His gaze lingered on the empty stretch of road where you had disappeared.
âYes,â he said at last. âBut keep your distance.â
A quiet shift behind him.
âAnd Eunjang?â
That made something in his expression change, though only slightly.
âDonât engage,â he replied. âNot yet.â
He turned then, the motion smooth and unhurried, his expression settling into something calm. Controlled.
But beneath that stillness, his thoughts continued to move.
You werenât fully with them.
But you werenât staying away either.
That was the problem.
Indecision didnât last in a place like this.
Not with the Union.
Not with Eunjang.
Not with him.
His hand slipped into his pocket, fingers brushing briefly against his phone before pulling it free. The screen lit up softly, illuminating his features for a fraction of a second.
No new messages.
Unnecessary.
He already knew enough.
You werenât choosing.
So you would have to be made to.
His thumb hovered over the screen, then stilled before locking it again.
You had been given space.
You hadnât taken it.
âYouâre making this harder than it needs to be,â he murmured under his breath.
Testing you once had been simple.
This time wouldnât be.
You avoided pressure too easily.
That had to change.
You needed something immediate.
Something unavoidable.
Something that would force a choice.
His expression didnât shift, but something colder settled behind it.
Eunjang.
A point of friction.
A point where you already stood too close.
Not you.
Not yet.
But someone close enough that you wouldnât be able to ignore it.
Tomorrow.
The thought settled with quiet certainty.
A situation.
A push.
Nothing excessive.
Just enough to see where you moved when the space around you closed in.
Toward them.
Or away.
Toward the Union.
Or against it.
His gaze lifted once more, settling briefly on the direction you had gone.
âIf you wonât step away,â he said softly.
The rest followed, quieter still.
âThen Iâll see where you run.â
The night swallowed the words, leaving nothing behind but silence.
And the quiet certainty that by this time tomorrow, you wouldnât be standing in the middle anymore.























