Ha-Jin (Yoon Jin-Seo), Yoo-Jin (Shin So-Yul), Tae-Suk (Kim Da-Hyun) and Kyoung-Chul (Lee Si-Yeon) all attended the same high school. Due to an unsavory incident, Yoo-Jin disappeared. 10 years later, these four people are now at the same place. The next day, Yoo-Jin, who is a budding novelist using the pen name of "Jin-Jin," is found dead. The other three are now suspects. Veteran detective Dae-Sik (Kim Min-Sang) tries to solve the case.
| Actor | Role |
|---|---|
 Kim Da-hyun문태석 | 문태석 |
 Lee Si-eon김경철 | 김경철 |
 Shin So-yul장유진 | 장유진 |
 Yoon Jin-seo서하진 | 서하진 |
 Han Ki-woong대식의 파트너 형사 역 | 대식의 파트너 형사 역 |
 Kim Min-sang박대식 역 | 박대식 역 |