金寅
The next morning when Yoo-jin enters the classroom, she discovers the corpse of one of the bullies on top of the desk, with a burned face. Meanwhile, the school hires a volunteer teacher, Lee Eun-ju, as the new art instructor. She starts to call the roll in her class and stumbles on seat number 29 as she mentions the name of a deceased girl, Kim In-sook. The students are terrified when they hear the name, and rush out of the classroom when they see her talking to thin air. The only one left is Yoo-jin, who tells Eun-ju that Kim In-sook doesn't exist. Eun-ju takes another look at the seat and realizes that there's no name at seat number 29. Suddenly, Yoo-jin sees a figure on Eun-ju's back. Investigations soon rise as the other three bullies die in the same manner. Finally, Yoo-jin realizes that the spirit of Kim In-sook is possessing her. She was the one who killed all of those bullies, even though she doesn't remember doing it.