A sickly girl Ju-ran transfers to a new sanitorium boarding school to regain health. But she discovers that students are disappearing and notices abnormal changes happening to her body. She suspects the school for what's happening and tries to discover what secret is hidden.
Unfortunately the movie The Silenced is not yet available on HBO Max.
| Art | Nam Il-yeon | Art Direction |
| Art | Kim Yun-suk | Props |
| Sound | Kim Kyoung-ho | Production Sound Mixer |
| Directing | Lee Hae-young | Director |
| Writing | Lee Hae-young | Writer |
| Costume & Make-Up | Kim Ho-sik | Special Effects Makeup Artist |
| Production | Kim-Jho Kwang-soo | Producer |
| Crew | Jo Won-cheol | Martial Arts Choreographer |
| Camera | Hwang Chang-gi | Grip |
| Visual Effects | Park Eui-dong | Visual Effects |
| Camera | Kim Il-yeon | Director of Photography |
| Art | Han Ah-rum | Production Design |
| Production | Lee Chi-beom | Producer |
| Sound | Dalpalan | Original Music Composer |
| Writing | Lee Yong-ju | Adaptation |
| Art | Lee Hwa-sung | Art Direction |
| Sound | Gong Tae-won | Sound Supervisor |
| Editing | Kim Chang-ju | Editor |
| Costume & Make-Up | Jang Yoon-jung | Makeup & Hair |
| Art | Song Suk-ki | Set Decoration |
| Lighting | Kim Min-jae | Lighting Director |
| Production | Shim Hyeon-u | Executive Producer |
| Costume & Make-Up | Ham Hyun-joo | Costume Design |
| Camera | Kim Hyeong-seok | Camera Operator |
