Composer
Director
Executive Producer
Screenwriter
Main Role
- Cha Tae HyunYoo Dong ManMain Role
- Jung Jin YoungKang Sun HoMain Role
- Krystal JungOh Kang HeeMain Role
Support Role
- Hong Soo HyunChoi Hee Soo [Judo professor]Support Role
- Lee Jong HyukKwon Hyeok Pil [Law professor]Support Role
- Kang Shin IlSeo Sang Hak [1st Year Head Professor & Professor of Forensics&Public Administration]Support Role
- Seo Ye HwaBaek Hee [Guidance department director]Support Role
- Choo Young WooPark Min KyuSupport Role
- Lee DalNo Beom Tae [Sun Ho's roommate]Support Role
- Yoo Young JaeJo Joon Wook [Sun Ho and Beom Tae's friend]Support Role
- Park Seung YeonMin Jae Kyung [Kang Hee's roommate]Support Role
- Lee Do HoonCha Sung Soo [Min Kyu's roommate]Support Role
- Jung Ha JoonPark Dong KooSupport Role
- Lee A InJo Sung EunSupport Role
- Kim Jong HoonHan Min Gook [Student president]Support Role
- Kim Jae InYoon Na Rae [Third year student & head of Judo team]Support Role
- Byeon Seo YoonLee Eon JuSupport Role
- Kim Tae HoonKang Myung JungSupport Role
- Song Jin WooPark Cheol Jin [Dong Man's partner]Support Role
- Shin Seung HwanGo Deok Bae / "Professor Go" [Gossi Beer pub owner]Support Role
- Yoon Jin HoTeam Leader Choi [Seoul Metro Police]Support Role
- Choi Seo WonJoo Kyung JangSupport Role
- Woo Yong HeeHyun Joo Im [Guidance counselor manager]Support Role
- Min Chae EunAn Hae JooSupport Role
- Lee Ki ChangMin WooSupport Role
- Yoo Hyun JongByeon Tae JinSupport Role
Guest Role
- Hong Dong YoungKang Sun Ho [Young] (Ep. 1)Guest Role
- Baek KangYoon Seung Beom [Young] (Ep. 1)Guest Role
- Kim Hyung Mook[Loan shark] (Ep. 1)Guest Role
- Yoon Boo Jin[Landlord's wife] (Ep. 1)Guest Role
- Kim Han Sang[Doctor] (Ep. 1)Guest Role
- Ju Ah Yeon[Nurse] (Ep. 1)Guest Role
- Kim Kwang Gyu[High school teacher] (Ep. 1)Guest Role
- Song Young Jae[Landlord] (Ep. 1, 16)Guest Role
- Choi Woo SungYoon Seung Beom [Sun Ho’s best friend & adoptive brother] (Ep. 1-2, 16)Guest Role
- Oh Man SeokYoon Taek Il [Seung Beom and Sun Ho's dad] (Ep. 1-3, 15-16)Guest Role
- Park Jae Wan[Officer presenting award] (Ep. 2)Guest Role
- Kim Young SunOh Yeo Sa [Kang Hee's mom] (Ep. 2, 4, 7, 9-10, 16)Guest Role
- Kwon Hyuk SooLim Tae Soo (Ep. 3)Guest Role
- Kook Joong Woong[Beom Tae's father] (Ep. 3, 16)Guest Role
- Kang Suk Won[Detective] (Ep. 4)Guest Role
- Nam Dong Ha[Truck driver] (Ep. 4)Guest Role
- Seon Yool Woo[Gambling house defendant] (Ep. 4)Guest Role
- Kim Young Sun[Doctor] (Ep. 4, 8)Guest Role
- Hwang Seung EonKim Eun Joo [Dong Man's fiancé] (Ep. 5)Guest Role
- Uhm Tae Ok[Fishery employee] (Ep. 5, 10)Guest Role
- Shin Dong RyukMr. Sung (Ep. 6, 8)Guest Role
- Lee Yoon Sang[Judge] (Ep. 7)Guest Role
- Park Yoo Mil[Prosecutor] (Ep. 7)Guest Role
- Kim Kwon[Jung Ja's attorney] (Ep. 7)Guest Role
- Choi Yi SunSeo Yeo Joon (Ep. 7-8)Guest Role
- Lee Dong Kyu[KCS Anchorman] (Ep. 8)Guest Role
- Kim Gyu Do[Detective] (Ep. 8-9)Guest Role
- Yoo YongOh Lim Sik (Ep. 9)Guest Role
- Kim Byung Chul[Professor] (Ep. 9)Guest Role
- Joshua Newton[Foreign currency exchange agent] (Ep. 10)Guest Role
- Lee Sung WooJang Jae Gyu [Gang member] (Ep. 10, 12-13)Guest Role
- Yoo Tae WoongChief Han Jung Sik [Investigation Department Head at Seoul Metro] (Ep. 11-15)Guest Role
- Jeon Yeong In[Internet Cafe Customer] (Ep. 12)Guest Role
- Kim Ji Su[Nurse] (Ep. 13)Guest Role
- Kim Hyun MyungPark Si Hyung (Ep. 14)Guest Role
- Bae Sung IlHan Min Ki (Ep. 14)Guest Role
- Kang Sung Ho[Manager] (Ep. 14)Guest Role
- Kim Chan HyungSeo Min Woo (Ep. 15)Guest Role
- Kim Nam Jin[Min Woo's mother] (Ep. 15)Guest Role
- Gu Bon Jin[Detective] (Ep. 15)Guest Role
- Kim Kye HyungSeo Min Woo (Ep. 15)Guest Role
- Kim Byung GiLim Tae Soo (Ep. 15-16)Guest Role
- Yun Ki Chang[Public administration professor] (Ep. 16)Guest Role
- Park So YoonKim Soon AeGuest Role
- Kang Chung HunIm Hyun Seok [Reporter]Guest Role
- Park Sang Eun[Police university cadet]Guest Role
- Shin Suk Min[Currency exchange employee] (Ep. 10)Guest Role
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