Chaidan (“Chai”) — a scholarship-funded boy originated from northern part of Thailand; Ghulsolsang (“Ghul”) — an avid photographer, searching for freedom; Sihnsamuth (“Sihn”) — sensitive and allergic; Pongketh ("Pong") — a good-looking student; and Traisoon (“Trai”) — who sees this school as a platform for him seeking popularity and becoming influential figure.

The boys befriended Numkang, the daughter of fierce Mr Sawaeng ("Waeng"), the school bad-tempered teacher.

One night after sneaking out to meet Numkang, Trai climbs to a hostel dorm and tries to get in through the bedroom window with help of a stranger's hand, before slipping and falling to his death.

Chatta possesses the body of weak Sihnsamuth to kill all the seniors that treat other students badly, electrocuting Tee and violently stabbing Joe with axe.

That night, father Theodore recalled his mistake for ignoring Chatta who pleaded of senior misconduct which led to his mental breakdown and eventually seeking revenge.

They use St George spear from a statue and with help of Daovadeung's spirit their manage to kill Sihnsamuth possessed by Chatta.