This is student ghost, look at the left side of the students there some thing strange there, that is looked like a woman with long hair. but she don't have face and she don't look like a human. this is looked like usually what we watch in the horror movie. May be it is caused by the student who die in the class then she came to her class and look for more friends. it is looked like hantu kuntilanak but i classify it as hantu wanita because she still so young. it so scary is not it?