Yoon Chan-young

In-su has a special power to see ghosts. One day, In-su meets a ghost who lost her memory and roams around the school. He opens up to her as they build up a quite special friendship and gradually accepts his power to see ghosts which he once thought of as a curse. In the meantime, students mysteriously go missing one by one while the story of the strange bloody mask ghost spreads throughout the school.

In the heart of the city, two sisters accidentally come across a serial killer who has turned the sewers beneath a manhole into his secret hideout.