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
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.
Watch it here
Not found streaming from Germany.