Dew, a young computer programmer, takes refuge in Chiang Mai. There, she is reunited with Ton, whom she met during her aunt's funeral, and discovers that he is the love of her life. Sadly, Ton is plagued by a brain tumor and passes away prematurely.
Unfortunately the movie The Letter is not yet available on HBO Max.
| Directing | Pa-oon Chantornsiri | Director |
| Production | Duangkamol Limcharoen | Producer |
| Costume & Make-Up | Thawatchai Petchvara | Costume Designer |
| Directing | Chinoret Kamwandi | First Assistant Director |
| Production | Somsak Techaratanaprasert | Executive Producer |
| Camera | Naruphol Chokanapitak | Director of Photography |
| Production | Ek Iemchuen | Production Designer |
| Writing | Kongdej Jaturanrasmee | Screenplay |
| Sound | Chatchai Pongprapaphan | Original Music Composer |
| Editing | Patamanadda Yukol | Editor |
| Production | Nonzee Nimibutr | Executive Producer |
| Sound | Boyd Kosiyabong | Original Music Composer |
| Production | Nonzee Nimibutr | Producer |
| Production | Phalathon Siraksa | Casting Director |
| Production | Ratchana Nimchareonpong | Production Manager |
| Sound | Suraprom Pinyosub | Sound Recordist |
| Sound | Thanapong Boonyachai | Sound Editor |
| Crew | Sunit Asavinikul | Mixing Engineer |
| Art | Kamolsak Khumsin | Art Direction |
