The Girl in a Tiny Room (2019)

A girl kills her friend with hypnosis. Heeju, who's spent an entire year in her room, regains confidence slowly and finally leaves the room. She also makes up with her mom and decides to re-enter the society But Haeyoung, the bully, finds out where she lives and the harassment starts again. Heeju wants to re-enter the society but is faced with an obstacle that is Haeyoung. Not wanting to go back to how things were before, she decides to use the hypnosis technique she learned to Haeyoung. She hypnotizes Haeyoung to kill herself and goes back to society.