Mary is in her last course of school. She'll confront sudden changes in her life, loving relations and friendship. Based on some tweets of an anonymous girl.
Unfortunately the movie Mary Is Happy, Mary Is Happy. is not yet available on HBO Max.
| Directing | Nawapol Thamrongrattanarit | Director |
| Production | Rasiguet Sookkarn | Production Designer |
| Costume & Make-Up | Phim U-mari | Costume Designer |
| Sound | Somsiri Sangkaew | Original Music Composer |
| Camera | Pairach Khumwan | Director of Photography |
| Crew | Pairach Khumwan | Cinematography |
| Editing | Chonlasit Upanigkit | Editor |
| Production | Pacharin Surawatanapongs | Associate Producer |
| Production | Aditya Assarat | Producer |
| Editing | Chaitawat Thrisansri | Color Timer |
| Art | Manop Chaengsawang | Art Direction |
| Sound | Chalermrat Kaweewattana | Sound Editor |
| Sound | Akritchalerm Kalayanamitr | Sound Editor |
| Production | Rujirumpai Mongkol | Location Manager |
| Costume & Make-Up | Pacharin Surawatanapongs | Makeup & Hair |
| Writing | Nawapol Thamrongrattanarit | Writer |
