Je-In is a mystery novel writer. She chases after a serial killer with her longtime friend Rok-Hwan. Rok-Hwan is a detective. A handsome and mysterious man, Jason, appears in front of them.
| Actor | Role |
|---|---|
 Ha Ji-wonHan Je-in | Han Je-in |
 Chun Jung-myungRok-hwan | Rok-hwan |
 Chen BolinJason Chen | Jason Chen |
 Yoon So-heeJung Yoo-mi | Jung Yoo-mi |
 Oh Jung-seHeo Jong-goo | Heo Jong-goo |
 Lee Da-inHan Je In (Teen) | Han Je In (Teen) |
 Jung Hae-kyunPresident Ji | President Ji |
 Kim Won-haePolice Officer | Police Officer |
 Kim Min-SeoNot listed | Not listed |
| JJoel RobertsDrunken | Drunken |
 Kang SookJapanese tourist | Japanese tourist |
 Lee Si-hyungNot listed | Not listed |