Sonyeogoedam (2014) on Netflix

Plot summary

In-su is a high school student who can see ghosts, and they follow him wherever he goes. His classmates harass him because of it. He moves to a small town to live with his uncle and to leave the past behind. There he meets a pretty girl who is a ghost, the first spirit he encounters in town, and she becomes his friend. Bullies at his new school remain a problem for him. The attacks begin soon after he arrives: a vengeful ghost in a bloody mask starts going after those bullies one by one. In-su and the girl set out to learn who is behind it.