. "Some enemies wear the faces of friends... until the mask slips."

When a sudden outbreak traps a group of students inside their rain-soaked school, survival becomes more than just escaping the infected.
Every hallway drips with secrets, every friendship hides a lie, and somewhere in the storm, two hooded figures watch - pulling strings that no one fully understands.

Tanu, Suhyeok, Sunghoon, Guddu, Jungwon and the others must navigate not only the horrors stalking them in the dark, but the betrayals within their own circle. Love triangles ignite under flickering lights, old promises echo in the chaos, and uneasy alliances are forged in blood.

But as the rain keeps falling and the truth begins to surface, one question refuses to let them go:
Who among them has been the real enemy all along?

Shocking twists. Tangled romances. A finale that will leave you breathless - in the shadows, no one is innocent.

The heavy clang of the front gates echoes like a death sentence.


Students pound on the bars, shouting for help — but outside, there's no rescue, only more of the staggering, blood-covered figures closing in.


On the rooftop, Tanu, Jake, and Sunghoon crouch low. Jake mutters, "Who the hell locked us in?"


Sunghoon scans the yard. "Not who. Why."


Guddu drags Ushika toward the main building, weaving between panicked students.


"Don't look back," Guddu says, breathless.


But Ushika does. A boy they passed seconds ago is now on the ground, his face buried in another student's neck.


Guddu's grip tightens. "Ushi… if one of us gets caught—"


"Don't," Ushika cuts her off. "We're both making it out."


Jungwon sprints down the hallway toward the gymnasium, phone clutched in hand. He nearly collides with Jay, who's holding a metal broomstick like a weapon.


"Stick with me," Jay says. "I know a way to the science lab — there's alcohol and scalpels."


In the locked storeroom, Suhyeok paces.


Minjae sits on the floor, sweating. "What if no one comes?"


Suhyeok glares. "Then we get ourselves out. I'm not waiting here to die."


He grips the doorknob. "We make for the kitchen. Food, water, knives—"


He hesitates. Krati's voice is trembling. "Please. Something's wrong with my building. I ran here."


Minjae unlocks the door before Suhyeok can stop him.


Krati stands there, hair messy, uniform torn at the sleeve. She smiles weakly—


Her teeth sink into Minjae's neck before he even screams. Blood splatters across Suhyeok's shirt.


Suhyeok shoves her back into the wall, rage in his eyes.


Krati lets out a deep, animal growl — and Suhyeok doesn't hesitate. He grabs a fire extinguisher and swings with all his strength.


Minjae collapses, clutching his neck. "Suh… don't… let me—"


Suhyeok kneels beside him for just a second before his friend goes still.


Suhyeok stands, chest heaving, blood dripping from his hands. His eyes are cold now.


Tanu's phone buzzes — a text from Guddu:


> "Rooftop. Stay inside. Don't trust anyone acting weird."


Jake notices the faint smile tugging at her lips when Guddu's name appears.


She glances at him. "Something like that."


Sunghoon interrupts. "We're moving. That gate's locked from inside, which means whoever did it is still here."


Guddu and Ushika make it inside — but the big double doors slam shut behind them. They spin around.


Standing in the middle of the hall is Niki, holding the keys to the gate in one hand… and a blood-stained baseball bat in the other.


"Everyone's running like scared little rabbits," he says. "But I think… we let the strong ones survive."


Guddu's eyes widen. "You locked us in?"


Niki tilts his head. "Us? No… just you."


Camera cuts to Suhyeok dragging Minjae's lifeless body into a classroom. His voice is low, but steady:


Chapter 4 - Episode 3 — “Locked In”