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.
Is The Letter on Netflix? Unfortunately the movie The Letter is not yet available on Netflix.
| Writing | Kongdej Jaturanrasmee | Screenplay |
| Camera | Naruphol Chokanapitak | Director of Photography |
| Sound | Boyd Kosiyabong | Original Music Composer |
| Production | Phalathon Siraksa | Casting Director |
| Editing | Patamanadda Yukol | Editor |
| Production | Ek Iemchuen | Production Designer |
| Costume & Make-Up | Thawatchai Petchvara | Costume Designer |
| Sound | Chatchai Pongprapaphan | Original Music Composer |
| Production | Nonzee Nimibutr | Producer |
| Directing | Chinoret Kamwandi | First Assistant Director |
| Production | Somsak Techaratanaprasert | Executive Producer |
| Production | Nonzee Nimibutr | Executive Producer |
| Production | Duangkamol Limcharoen | Producer |
| Sound | Suraprom Pinyosub | Sound Recordist |
| Sound | Thanapong Boonyachai | Sound Editor |
| Art | Kamolsak Khumsin | Art Direction |
| Crew | Sunit Asavinikul | Mixing Engineer |
| Production | Ratchana Nimchareonpong | Production Manager |
| Directing | Paoon Jansiri | Director |
| Directing | Naruemon Sutassanajinda | Second Assistant Director |
| Costume & Make-Up | Thanakorn Yimngam | Hairstylist |
| Costume & Make-Up | Jirawat Tasai | Makeup Artist |
| Costume & Make-Up | Vittaya Deerattrakul | Special Effects Makeup Artist |
| Lighting | Chaloem Phaiphat | Gaffer |
| Writing | Lee Jung-gook | Original Film Writer |
| Writing | Kim Moo-ryoung | Original Film Writer |
