A boy who can see ghosts moves to a small town, where he befriends a female ghost. The two work together to investigate a masked ghost who is murdering students one by one.
Unfortunately the movie Mourning Grave is not yet available on HBO Max.
| Lighting | Kang Dae-hui | Lighting Director |
| Sound | Sung Yoon-yong | Sound Supervisor |
| Sound | Kim Hyun-sang | Production Sound Mixer |
| Writing | Lee Jong-ho | Writer |
| Production | Lee Jong-ho | Producer |
| Visual Effects | Cho E-suck | VFX Supervisor |
| Directing | Oh In-chun | Director |
| Production | Lee Hong-Ho | Producer |
| Production | Lee Hong-Ho | Producer |
| Production | Joo Ho-sung | Producer |
| Production | Lee Sang-Hun | Producer |
| Crew | Kwon Sang-Joon | Cinematography |
| Visual Effects | Song Seung-whan | VFX Supervisor |
| Directing | Yoon Jung-jin | Assistant Director |
| Editing | Kim Chang-ju | Editor |
| Costume & Make-Up | Jang Joo-hee | Costume Design |
| Art | Lee Hyun-joo | Production Design |
| Lighting | Kim Uk | Lighting Director |
| Sound | Lee In-gyu | Sound Supervisor |
