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.
| Actor | Role |
|---|---|
 Park Bo-youngJoo-ran | Joo-ran |
 Uhm Ji-wonKato Sanae | Kato Sanae |
 Park So-damYeon-deok | Yeon-deok |
 Kong Ye-jiYuka | Yuka |
 Sim Hee-seopKenji | Kenji |
 Go Won-heeShizuko | Shizuko |
 Keum Sae-rokNaoko Oyama | Naoko Oyama |
 Joo Bo-biKihira | Kihira |
 Park Seong-yeonCounselor | Counselor |
 Park Joo-heeJoo-ran's Mother | Joo-ran's Mother |
 Park Se-inEguchi | Eguchi |
 Mok Gyu-riAkimi Kimoto | Akimi Kimoto |
 Kim Dong-hyunDriver | Driver |
| LLee Ye-eunCenter | Center |
 Kim Soo-binKokomi Yasuda | Kokomi Yasuda |
 Cho RyunHome economics teacher | Home economics teacher |
 Gong TeyuJapanese soldier (voice) | Japanese soldier (voice) |