Composer
Director
Screenwriter
Main Role
- Park Jin YoungLee AhnMain Role
- Shin Ye EunYoon Jae InMain Role
- Kim KwonKang Sung MoMain Role
- Kim Da SomEun Ji SooMain Role
Support Role
- Noh Jong HyunLee Dae Bong [Lee Ahn's best friend]Support Role
- Go Youn JungKim So Hyun [Jae In's friend]Support Role
- Kim Hyo JinOh Sook Ja [Jae In's aunt]Support Role
- Park Chul MinNam Dae Nam [Police lieutenant]Support Role
- Sa KangHong Soo Yun [Dr. Hong]Support Role
- Jang Eui SooLee Seung Yong [Investigator]Support Role
- Uhm Hyo SubEun Byung Ho [Ji Soo's father]Support Role
- Jung Suk YongYoon Tae Ha [Jae In's father]Support Role
- Jeon Mi SeonJo Eun Joo [Sung Mo's mother]Support Role
- Lee Seung JoonKang Geun Taek [Sung Mo's father]Support Role
- Kim Tae YulLee Ahn [Young]Support Role
- Kim Soo InYoon Jae In [Young]Support Role
- Cho Byeong KyuKang Sung Mo [Young]Support Role
- Choo Ye JinEun Ji Soo [Teenage]Support Role
- Lee Won JinDetective LeeSupport Role
- Lee Joo Hyung[Student]Support Role
- Park Dong Bin[Police officer following 'Code of Police']Support Role
- Kim Sung JunLee Dae Bong [Young]Support Role
Guest Role
- Lee Yoo HaYoo Jin Hee [Lee Ahn's mother] (Ep. 1)Guest Role
- Shin Min JooEun Sae [Jae In's enemy] (Ep. 1)Guest Role
- Park Yong[Teacher] (Ep. 1)Guest Role
- Kim Ki MooHong Jung Soo [Cheongdo high school teacher] (Ep. 1-2, 4)Guest Role
- Lee Jong HyukLee Jung Rok [Lee Ahn's father] (Ep. 1, 8)Guest Role
- Choi Woo Ri[Homeroom teacher] (Ep. 1-2)Guest Role
- Kim Won Hae[Math teacher] (Ep. 1-3)Guest Role
- Jo Hye Joo[Student] (Ep. 1-3)Guest Role
- Choi Deok MoonKim Gab Young (Ep. 1-3, 6, 13)Guest Role
- Jung Young Joo[The female president of Youngseong Apartment] (Ep. 1, 5, 15)Guest Role
- Ban Hye Young[Nurse witness] (Ep. 1, 11)Guest Role
- Lee Jung JoonAhn Kyung Soo (Ep. 2)Guest Role
- Choi Jae Hyun[Student] (Ep. 2)Guest Role
- Kim Hak Seon[Priest] (Ep. 2, 4, 11)Guest Role
- Kim Seon Hwa(Ep. 5)Guest Role
- Chae Yoo Ri[Child] (Ep. 9)Guest Role
- Kwon Hyuk Soo[Judge] (Ep. 16)Guest Role
- Jung Ji HoonKang Sung Mo [Child]Guest Role
- Kang Tae UngLee Dae Bong [Young]Guest Role
- Kim Ji SungJi Sung [A part-timer at Dae Bong's gas station]Guest Role
- Kim Ji Hwan[Hospital kid]Guest Role
- Park Ki RyungNoh Jeong Hoon [General prosecutor]Guest Role
- Cha Hee[Lady from prosecution office] (Ep. 15)Guest Role
- Song Chang Gyu[Prisoner]Guest Role
- Lee Si Young[Nurse]Guest Role
- Park Joon Soo[Honor student]Guest Role
- Tae Yul[Corpse]Guest Role
- Suh Sang Won[Detective]Guest Role
- Jang Ye Rim[Bully group]Guest Role
- Jung Kyung Ho[Detective]Guest Role
- Seo Sang Won[Detective]Guest Role
- Moon Hak Jin Guest Role
- Cho Ah Yeon[Neighborhood kid]Guest Role
Unknown
- Won Seong Yeon Unknown
- Kwon Ye Eun Unknown
- Jo Yeong Jae Unknown
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