March is mourning his wife Nat who has recently passed away due to dust pollution. He discovers her spirit has returned by possessing the vacuum cleaner. Being disturbed by a ghost that appeared after a worker's death shut down their factory, his family reject the unconventional human-ghost relationship. Trying to convince them of their love, Nat offers to cleanse the factory. To become a useful ghost, she must first get rid of the useless ones.
Unfortunately the movie A Useful Ghost is not yet available on HBO Max.
| Directing | Ratchapoom Boonbunchachoke | Director |
| Writing | Ratchapoom Boonbunchachoke | Writer |
| Production | Cattleya Paosrijaroen | Producer |
| Production | Soros Sukhum | Producer |
| Editing | Chonlasit Upanigkit | Editor |
| Crew | Pisit Tandaechanurat | Cinematography |
| Production | Tanade Amornpiyalerk | Associate Producer |
| Editing | Chaitawat Thrisansri | Colorist |
| Costume & Make-Up | Phim U-mari | Costume Designer |
| Sound | Ting Li Lim | Supervising Sound Editor |
| Sound | Richard Hocks | Sound Mixer |
| Sound | Chaibovon Seelookwar | Original Music Composer |
| Production | Supapit Chirattikanon | Post Producer |
| Production | Pakkawat Tanghom | Location Manager |
| Production | Tippawan Narintorn | Casting Director |
| Production | Soifa Saenkhumkon | Casting Director |
| Production | Rasiguet Sookkarn | Production Designer |
| Production | Karim Aitouna | Co-Producer |
| Production | Tan Si En | Co-Producer |
| Production | Chayamporn Taeratanachai | Executive Producer |
| Production | Rachel Y. Wu | Executive Producer |
| Production | Kris Eiamsakulrat | Executive Producer |
| Production | Kip Tiaviwat | Executive Producer |
| Production | Annie Yang | Executive Producer |
| Production | Tanat Tananivit | Executive Producer |
| Production | May Odeh | Co-Producer |
| Production | Zorana Musikic | Co-Producer |
| Production | Thanarith Satrusayang | Co-Producer |
| Costume & Make-Up | Chatree Tengha | Costume Designer |
| Directing | Chutigan Seechomphu | First Assistant Director |
| Directing | Kantapat Puttasawan | Second Assistant Director |
| Sound | Wong Hui Grace | Sound Designer |
| Production | Kiattisak Kingkaew | Production Accountant |
| Production | Sirapat Suthonwattanacharoen | Production Assistant |
| Production | Joel Neo Rui En | Producer's Assistant |
| Sound | Amelia Sai | Sound Editor |
| Sound | Ting Li Lim | Dialogue Editor |
