When his wife is murdered, Dong-ho loses the light in his life, breaks down and falls into depression. But he knows that as long as the killer is still around, he can not get out of his loss. Then, one day, he receives a call and can not believe who he is listening to.
| Actor | Role |
|---|---|
 Son Hyun-jooGo Dong-ho | Go Dong-ho |
 Uhm Ji-wonJo Yeon-soo | Jo Yeon-soo |
 Bae Sung-wooDo Jae-hyeon | Do Jae-hyeon |
 Roh Jeong-euiGo Kyeong-rim | Go Kyeong-rim |
 Jang In-subDepartment Head Kim | Department Head Kim |
 Jo Dal-hwanKim Gyoo-soo | Kim Gyoo-soo |
 Lee Cheol-minSon Seok-ho | Son Seok-ho |
 Hwang Seok-jeongSeo Gwang-hyeon | Seo Gwang-hyeon |
 Hwang Bo-raKim Hye-jin | Kim Hye-jin |
 Kim Jong-gooPark Se-moon | Park Se-moon |
 Kim Ki-cheonDispatch Captain | Dispatch Captain |
 Seo Byeong-cheolSeocho Police Station Detective | Seocho Police Station Detective |
 Anupam TripathiCharles | Charles |
 Jung Jong-wooManspreader | Manspreader |
 Ryu Sun-gyuInvestigator | Investigator |
 Jung Ki-sunPoliceman at the Lotus Lantern Festival | Policeman at the Lotus Lantern Festival |
 Shin Young-gyuHigh Schooler | High Schooler |
 Lee Ha-rangMiss | Miss |