A small town detective is presented with a missing person case, which becomes more baffling the deeper he digs into it. The investigation begins with the disappearance of a high-school girl: then, as unexpected people turn up in the case, it becomes ever more baffling. There seems to be a motive, but nothing is obvious: what is the hidden mystery behind this case?
| Actor | Role |
|---|---|
 Kim Byeong-okDetective Choi | Detective Choi |
 Ji Dae-hanMin-sung | Min-sung |
 Kang Sung-hoSung-il | Sung-il |
 Park No-shikDetective Kim | Detective Kim |
| LLee Do-hyeonDetective Bae | Detective Bae |
 Yu Da-eunGwi-won | Gwi-won |