Ancient Korea, 1506. The tyrannical King Yeonsan-gun of Joseon is overthrown by his half-brother Jung-jong, whose reign begins with a blood bath. Over the years, traitors plot against him, sinking the kingdom into chaos. In 1528, frightened rumors come to royal palace, regarding a mysterious creature, known as Monstrum by the peasants.
Unfortunately the movie Monstrum is not yet available on HBO Max.
| Directing | Huh Jong-ho | Director |
| Camera | Kim Dong-young | Director of Photography |
| Art | Im Seong-mi | Art Direction |
| Production | Cha Won-chun | Co-Executive Producer |
| Art | Jang Chun-sup | Production Design |
| Production | Chung Tae-won | Producer |
| Costume & Make-Up | Shim Hyun-seob | Costume Design |
| Production | Ko Sung-mi | Producer |
| Production | Yang Chang-hoon | Producer |
| Production | Jeong Gyeong-jae | Executive Producer |
| Writing | Huh Jong-ho | Screenplay |
| Sound | Mowg | Original Music Composer |
| Editing | Shin Min-kyung | Editor |
| Production | Hyun Gwang-seo | Line Producer |
| Sound | Jeong Ji-young | Sound Effects Designer |
| Visual Effects | Park Yeong-su | Senior Visual Effects Supervisor |
| Editing | Jang Lae-won | Assistant Editor |
| Visual Effects | Seo Doo-hyeong | VFX Artist |
| Art | Kim Yeong-bok | Props |
| Camera | Lee Eui-tae | Camera Operator |
| Crew | Hwang Jin-mo | Stunts |
| Crew | Yang Hae-gil | Stunts |
| Sound | Kim Seong-woo | Foley Mixer |
| Crew | Lee Tae-ho | Stunts |
| Sound | Park Jong-geun | Production Sound Mixer |
| Visual Effects | Hong Jang-pyo | Special Effects Supervisor |
| Visual Effects | Cho Yong-seok | VFX Supervisor |
| Lighting | Kim Hyeong-yong | Lighting Director |
| Art | Jeon Sung-ho | Set Decoration |
| Visual Effects | Yoon Choong-yeol | VFX Supervisor |
| Crew | Choi Seong-kyum | Stunts |
| Visual Effects | Lee Hyun-dong | VFX Supervisor |
| Crew | Lim Wang-sub | Stunts |
| Crew | Ko Hyun-woong | Martial Arts Choreographer |
| Visual Effects | Lee Eun-mi | Compositing Artist |
| Editing | No Byeong-uk | Digital Colorist |
| Visual Effects | Park Seong-hyeon | Compositing Artist |
