Gi-hun Kim

A high school students took a prank too far, resulting in the death of a classmate. After burying him alive, he lashes out from the grave, only to mysteriously disappear just as quick. However, they had also videotaped the act for their own amusement. Now, a masked murderer is tracking the group of five's every move, picking them off one-by-one, while showing portions of the film in random public places. (mydramalist.com)