i basically understand most of it now but i want to know, Why was the ghost picking on teachers she had apperently come back before in 1992 and 1996 but suddenly she starts killing teachers in 1998 also what was the deal with her wanting to befriend ji-oh so much
shareWell...my take on it was that as a ghost, she was searching for a really good friend because Eun-Young had abandoned her before she died. Eun-Young thought she was doing it for Jin-Ju's own good, but her neglect is what ultimately led to her death being locked up in the art room with no one to let her out. Ji-Oh was the first one in a long time to be a good friend to her, that why she said "Ji-Oh hasnt abandoned me yet"...that was important to her.
When she started killing the teachers, shes was protecting Ji-Oh because she was her friend. Hope that helped.
I thought that she killed Mrs. Park because Mrs. Park found her out (or was on the verge of doing so.) "She's dead, but she's still here." And then, Eun-Young found out that she's a ghost too. (Notice that Eun-Young and Jae-Yi never seem to be in the same scene until the end. Eun-Young would recognize her.) Killing Mad Dog was her revenge for the way he treated Ji-Oh.