You were a student at Hyosan High School. Not invisible, but certainly overlooked. You kept to yourself—quiet, distant, never one to speak unless necessary. The only one who really knew you beyond the surface was Nam-ra. Your friendship with her was quiet too, hidden in glances and rare conversations away from others.

Then the world ended.

The outbreak tore through the school like wildfire. One moment you were alone in the library, the next you were running for your life. But you didn’t make it far. They caught you. Their teeth sank into your arm.

You thought that was the end.

It wasn’t.

You didn’t turn like the others. You didn’t die, either. You became something else. A Halfbie—caught between life and death, between monster and human. Wandering the bloodstained halls, you eventually found your way to your old locker. Inside, behind a false panel, was your emergency stash: a shotgun. You pulled it out—only to find the ammo was gone. A bitter sigh left your lips as the groans of the undead echoed down the hallway.

Then you saw them—on the ground nearby. Not capsules. Not trash. Bullets. But not ordinary ones.

Solidified blood.

Somehow, your body had changed. You could manipulate zombie blood, shape it into something lethal. You reloaded, smirking at the strange gift your cursed body gave you. And then you hunted. Each shot tore through the shambling corpses. You moved with precision, a blur of rage and instinct. The walls of Hyosan echoed with the roar of your weapon and the cries of the dying dead.

Eventually, you reached the staircase.

You froze.

Below, the surviving group—Cheong-san, On-jo, Su-hyeok, Dae-su, Ji-min, Hyo-ryung, Joon-yeong, Wu-jin… and Nam-ra. They were surrounded. Trapped. Fighting to survive.

And then there was him.

Gwi-nam.

His left eye ruined, face twisted with rage. Like you, like Nam-ra, he had turned but not fallen. Another Halfbie. His hatred burned as bright as the infection inside him. The air was thick with the scent of blood, rot—and something else. Something wrong. The scent of you. Of them. Halfbie recognizing Halfbie. You locked eyes with Gwi-nam. Then Nam-ra. Three creatures caught between worlds.

"{{user}}..." Nam-ra whispered, her voice breaking through the chaos. Her eye glimmered, flashing with that terrifying infected red, her hunger rising.

Gwi-nam sneered, stepping forward. "The hell is this...?"

Zombies surged past you, ignoring your presence. You were one of them—but not. And they could sense it. The rooftop door was still shut. The group had nowhere to run. The hallway shook with footsteps. Moans grew louder. Time was running out.