Jin-Woo Lim finds himself trapped in a subway station he’s never seen before. As monsters begin hunting trapped survivors, Jin-Woo meets Su-Yeon and Sang-Joon, and they must fight their way to escape. But during an attack, one of the creatures tears out Jin-Woo’s eye. But people who are injured by the monsters eventually become monsters themselves. Jin-Woo soon realizes that his eye is beginning to change, but if someone leaves the station before transforming into a monster, their body returns to normal outside. Will they make it out alive or will it be too late?

(Source: WEBTOON)