When old friends from school start dying one by one, Sayree and Nataya begin to search for the secret of the letter that each of their friends received before death. Soon the two believe they are the next targets.
| Directing | Kapon Thongphlap | Director |
| Writing | Kapon Thongphlap | Story |
| Writing | Jatuporn Boonkode | Screenplay |
| Directing | Watcharapol Fukjaidee | Director |
| Directing | Mate Yimsomboon | Director |
| Production | Somsak Songtunmakul | Executive Producer |
| Production | Piti Jaturaphat | Producer |
| Production | Kanitta Sukasame | Producer |
| Directing | Thitipong Chaisati | First Assistant Director |
| Camera | Piti Jaturaphat | Director of Photography |
| Production | Worrawut Sriwilai | Production Designer |
| Art | Worrawut Sriwilai | Art Direction |
| Costume & Make-Up | Anchana Srifa | Costume Designer |
| Costume & Make-Up | Saipin Yaisomelee | Costume Designer |
| Editing | Saravuth Nakajad | Editor |
| Crew | Saravuth Nakajad | Post Production Assistant |
| Sound | Terdsak Janpan | Original Music Composer |