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.
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| Writing | Lee Hae-young | Writer |
| Directing | Lee Hae-young | Director |
| Production | Kim-Jho Kwang-soo | Producer |
| Camera | Kim Il-yeon | Director of Photography |
| Art | Han A-reum | Production Design |
| Production | Lee Chi-beom | Producer |
| Sound | Dalpalan | Original Music Composer |
| Art | Lee Hwa-sung | Art Direction |
| Writing | Lee Yong-ju | Adaptation |
| Costume & Make-Up | Jang Yoon-jung | Makeup & Hair |
| Art | Song Suk-ki | Set Decoration |
| Sound | Gong Tae-won | Sound Supervisor |
| Editing | Kim Chang-ju | Editor |
| 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 |
| Art | Nam Il-yeon | Art Direction |
| Art | Kim Yun-suk | Props |
| Visual Effects | Park Ui-dong | Visual Effects |
| Sound | Kim Kyoung-ho | Production Sound Mixer |
| Crew | Jo Won-cheol | Martial Arts Choreographer |
| Camera | Hwang Chang-gi | Grip |
| Costume & Make-Up | Kim Ho-sik | Special Effects Makeup Artist |
