Dorm
เด็กหอ (original)
When 12-year-old Ton transfers to an all-boys boarding school, he's taunted by his peers and terrified by their tales about the ghosts that inhabit the school. Ton is utterly miserable until he befriends a mysterious fellow pupil.
Starring Chintara Sukapatana, Charlie Trairat, Sirachuch Chienthaworn, Suttipong Tudpitakkul, Nipawan Taveepornsawan, Monton Annupabmard, Natapohn Tameeruks, Jirat Sukchaloen, Nipawan Thaveepornsawand, Thanabodin Sukserisup
Watch "Dorm" on Kanopy released in 2006. It's a drama and horror movie, and has a rating of 6.8 out of 10 from Imdb which is usually fine for this kind of movie.