Kati, a nine-year-old girl whose mother is suffering from an incurable illness. She must go through steps of happiness and sorrow, bonding and separation, having her hopes fulfilled and losing something she loves.
Unfortunately the movie Happiness of Kati is not yet available on HBO Max.
| Camera | Tanon Sattarujawong | Director of Photography |
| Writing | Jane Vejjajiva | Screenplay |
| Editing | Patamanadda Yukol | Editor |
| Production | Jatusom Techaratanaprasert | Producer |
| Directing | Genwaii Thongdenok | Director |
| Art | Thumrongrat Vanichsombat | Art Direction |
| Writing | Genwaii Thongdenok | Screenplay |
| Production | Akekarat Homlaor | Production Designer |
| Costume & Make-Up | Kornkanok Sanitwong Na Ayutthaya | Costume Designer |
| Sound | Nop Ponchamni | Original Music Composer |
| Writing | Jane Vejjajiva | Story |
| Production | Somsak Techaratanaprasert | Executive Producer |
| Production | Sutita Ruangronghirunya | Producer |
| Directing | Boonchai Kanlayasiri | Second Assistant Director |
| Directing | Prakasit Patrathranond | First Assistant Director |
| Production | Chatchai Phutsorn | Casting |
| Art | Pichan Muangduang | Assistant Art Director |
| Costume & Make-Up | Worachot Ubping | Makeup Artist |
| Costume & Make-Up | Pornthep Mongkonsakulkit | Hairstylist |
| Sound | Chakhrit Boriboon | Sound Recordist |
| Sound | Hickey Chaval Eugene | Sound Recordist |
| Sound | Kantee Anantagant | Original Music Composer |
| Sound | Kamonpat Pimsan | Original Music Composer |
| Sound | Somchai Chansook | ADR Recordist |
| Sound | Sakolthin Srisaeng | Sound Editor |
| Sound | Thanapong Boonyachai | Sound Editor |
| Crew | Vinai Srirat | Mixing Engineer |
| Crew | Phannipha Kabillikavanich | Mixing Engineer |
| Crew | Sunit Asavinikul | Mixing Engineer |
