Composer
Director
Screenwriter
Main Role
- Lee Seung Gi Main Role
- Lee Hee Joon Main Role
- Park Ju Hyun Main Role
- Kyung Soo Jin Main Role
Support Role
- Woo Ji HyunKoo Dong Goo [Ba Reum's friend]Support Role
- Ahn Jae WookHan Seo Jun [Neurosurgeon]Support Role
- Kim Jung NanSung Ji Eun [Seo Jun's wife]Support Role
- Kwon Hwa WoonSung Yo Han [Doctor]Support Role
- Jo Jae YoonDaniel Lee [Researcher]Support Role
- Hyun Bong SikBok Ho Nam [Police Chief]Support Role
- Ahn Nae SangPark Du Seok [Detective]Support Role
- Yoon Seo HyunKang Ki Hyeok [Detective]Support Role
- P.OShin Sang [Detective]Support Role
- Kim Min SooLee Min Soo [Detective]Support Role
- Kang Mal Geum[Ba Reum's aunt]Support Role
- Jung Ae RiChoi Young Shin [Government official]Support Role
- Kim Kang HoonJae HoonSupport Role
- Kim Ye SungPark Hyun SukSupport Role
- Jung Min Joon Support Role
Guest Role
- Kim Dong HaJae Min [Jae Hoon's step-brother] (Ep. 1, 18)Guest Role
- Ahn Seo YeonJae Hee [Jae Hoon's step-sister] (Ep. 1, 18)Guest Role
- Park YongKim Ji Wan (Ep. 1)Guest Role
- Lee Ja RyoungKim Woo Sun (Ep. 1)Guest Role
- Yoon Bok SungJung Joong Suk (Ep. 1)Guest Role
- Min Eung ShikShin Jae Hyung (Ep. 1)Guest Role
- Jang Eui DonAttorney Hwang [Seo Jun's lawyer] (Ep. 1)Guest Role
- Seo Woo JinJae Hoon [Young] (Ep. 1)Guest Role
- Song Min JaeKo Moo Chi [Young] (Ep. 1)Guest Role
- Yoo Ha BokShin Sung Min [Assembly chairman] (Ep. 1, 7, 13-14, 18, 20)Guest Role
- Ha YoungSong Soo Jung (Ep. 1, 8)Guest Role
- Park So YiChoi Hong Joo [Young] (Ep. 1, 15, 19-20)Guest Role
- Kang Chan Yang[Nurse] (Ep. 1)Guest Role
- Jung Kang Hee[Moo Chi's father] (Ep. 1)Guest Role
- Seo Jung Yeon[Moo Chi's mother] (Ep. 1)Guest Role
- Kim Mi Hye[Jae Hoon's teacher] (Ep. 1)Guest Role
- Sung Chan Ho[Government official] (Ep. 1)Guest Role
- Han Chang Hyun[Government employee] (Ep. 1)Guest Role
- Park Byung Wook[South Korean President] (Ep. 1)Guest Role
- Kim Min KyungOh Mi Soon [Soo Jung's mother] (Ep. 1-2, 16-17, 20)Guest Role
- Lee Seo JoonNa Chi Kook [Ba Reum's high school friend / Prison guard] (Ep. 1-2, 5, 14-15)Guest Role
- Kim Young Ok[Bong Yi's grandmother] (Ep. 1-3)Guest Role
- Kim Young JaeKo Moo Won (Ep. 1-5)Guest Role
- Jo Yeon HoKo Moo Won [Young] (Ep. 1, 6)Guest Role
- Jung Suk YongWoo Jae Pil (Ep. 1, 8-10)Guest Role
- Kim Kyul[Jae Hoon's father] (Ep. 1, 17-18)Guest Role
- Lee Eon Jeong[Ba Reum's mother] (Ep. 1, 17, 20)Guest Role
- Joo Ye RimOh Bong Yi [Young] (Ep. 2)Guest Role
- Seo Dong HyunKo Moo Chi [Young] (Ep. 2)Guest Role
- Im Yu Ran[Witness] (Ep. 2)Guest Role
- Na Ho Won[Bus driver] (Ep. 2)Guest Role
- Park Hye NaByun Soon Young [Victim] (Ep. 2)Guest Role
- Seon Ah RinJo Mi Jung (Ep. 2-3, 5)Guest Role
- Jung Eun PyoKang Duk Soo (Ep. 2-3, 7-8, 10-12)Guest Role
- Bae Sung Il[Detective] (Ep. 2-3)Guest Role
- Lee Si Young[ER nurse] (Ep. 2-3)Guest Role
- Chun Jung Ha[Chi Kook's mother] (Ep. 2-3, 16)Guest Role
- Song In Seop[Prison doctor] (Ep. 2, 6)Guest Role
- Yoo Yong[Sisters killer] (Ep. 2, 9)Guest Role
- Kim Woo JinKim [Police officer] (Ep. 2, 14)Guest Role
- Song Boo GeonSong Soo Ho (Ep. 2, 17)Guest Role
- Jung Woon[Gangster] (Ep. 3)Guest Role
- Jung Nan Hee[Teacher] (Ep. 3)Guest Role
- Kwak Min Ho[Prisoner] (Ep. 3)Guest Role
- Kim Ro Sa[Student's mother] (Ep. 3)Guest Role
- Kim Ha EonKim Han Kook (Ep. 3-4)Guest Role
- Son Woo HyunKim Joon Seong (Ep. 3-4, 18)Guest Role
- Baek Jae WooSong Soo Ho [Young] (Ep. 3, 16-20)Guest Role
- Park Eun Young[Staffing agency woman] (Ep. 3-4)Guest Role
- Lee Do Hyung[Ba Reum's uncle] (Ep. 3, 14)Guest Role
- Kang Suk Won[Talk show guest] (Ep. 4)Guest Role
- Oh Ji Young[Talk show guest] (Ep. 4)Guest Role
- Jang Jae Kwon[Talk show guest] (Ep. 4)Guest Role
- Park Jae Wan[Police commissioner] (Ep. 4)Guest Role
- Jo Wan KiReporter Yang (Ep. 4-5)Guest Role
- Park Ki Ryung[OBN News chief] (Ep. 4-5)Guest Role
- Cherish Maningat[Han Kook's mother] (Ep. 4-5, 15, 20)Guest Role
- Oh Seung ChanPark [Medical examiner] (Ep. 4, 10)Guest Role
- Yang Ha YoonMin Jung (Ep. 5)Guest Role
- Kim Hyo KyungByun Min Ji (Ep. 5)Guest Role
- Byun Yoon JeongMrs. Oh (Ep. 5)Guest Role
- Kim Young Joo[Staff] (Ep. 5)Guest Role
- Shim Yoo Seung[Staff] (Ep. 5)Guest Role
- Uhm Hye Soo[Police officer] (Ep. 5)Guest Role
- Kim Joo Ah[Orphanage employee] (Ep. 5)Guest Role
- Choi Yi Sun[Motorcycle deliveryman] (Ep. 5)Guest Role
- Chae Yeon Hee[Grocery store employee] (Ep. 5)Guest Role
- Kim Sung Kyung[Fact Check host] (Ep. 5-6)Guest Role
- Oh Min Joon[Bully] (Ep. 5, 9)Guest Role
- Kang Ro ChaePark Hye Won [Hostess bar worker] (Ep. 5, 10)Guest Role
- Bo Ra Na[Hostess bar manager] (Ep. 5, 10)Guest Role
- Hwang Se OnKim Da Seul [Shin Sang's girlfriend] (Ep. 6, 13-14)Guest Role
- So Yun Ho[Police officer] (Ep. 6)Guest Role
- Kang Moon Kyung[President] (Ep. 6, 12)Guest Role
- Kim Ah Ram[Ji Eun's employee] (Ep. 7)Guest Role
- Shin Hee Gook[Dong Goo's friend] (Ep. 7)Guest Role
- Park Joon Sang[Disciplinary hearing judge] (Ep. 7)Guest Role
- Park Jong Moo[Tie-knot expert] (Ep. 7)Guest Role
- Jeong Yoon Hee[Reporter] (Ep. 7)Guest Role
- Song Jae HeeWoo Hyung Chul [Attorney] (Ep. 7-10)Guest Role
- Hong Eun JeongSeul Ki [Dong Goo's fiance] (Ep. 7, 10)Guest Role
- Cha Seung Min[NFS staff] (Ep. 6)Guest Role
- Kwon Hyuk Soo[Doctor] (Ep. 7-10, 17, 19-20)Guest Role
- Jung Ja Young[Motel staff] (Ep. 16)Guest Role
- Jung Hee Young[Store owner] (Ep. 3)Guest Role
- Choi Min KyuHan Soo Chul [Young] (Ep. 14, 20)Guest Role
- Kim Young Mi[Announcer]Guest Role
- Jeong Seung Wook[Messenger] (Ep. 2)Guest Role
- Pyo Chang Won[Profiler] (Ep. 20)Guest Role
- Seon Yool Woo[Detective]Guest Role
- Jang Dae WoongPark Joo Young (Ep. 2, 4) [Police Officer]Guest Role
- Kim Deok Ju[Jae Hoon's neighbor] (Ep. 17)Guest Role
- Lee Wang Soo[Computer repairman] (Ep. 15, 18)Guest Role
- Kim Jung Han[Man @ bus stop] (Ep. 2)Guest Role
- Kim Dae Kook[Police officer]Guest Role
- Yeo Woon Bok[Doctor] (Ep. 7, 14)Guest Role
- Kim Soo InChoi Hong Joo [Young] (Ep. 8)Guest Role
- Hong Suk YounKim Baek Ki (Ep. 8)Guest Role
- Park Hyun JeongKim Young Hee (Ep. 8)Guest Role
- Jung Hyun SeokNo Young Hoon [Doctor] (Ep. 8)Guest Role
- Ji Sung Geun[Police officer] (Ep. 8)Guest Role
- Jung Byung HoJung Man Ho (Ep. 8-10)Guest Role
- Shin Yeon Suk[Duk Soo's mother] (Ep. 8, 10)Guest Role
- Seo Min SungKim [Prison officer] (Ep. 9)Guest Role
- Go Woo RiJennifer (Ep. 9)Guest Role
- Paul Battle[Cambridge doctor] (Ep .9)Guest Role
- Ok Il Jae(Ep. 9)Guest Role
- Kim Moon HoLee Jae Sik [Prisoner] (Ep. 9, 13-14)Guest Role
- Jang Yong ChulKim Bong Cheol [Prisoner] (Ep. 9, 13-14)Guest Role
- Garrison Michael Farquharson-KeenerDr. Fallon (Ep. 9)Guest Role
- Hwang Yoon Joo[Stalked woman] (Ep. 9)Guest Role
- Hwang Jung Yoon[Stalked woman's sister] (Ep. 9)Guest Role
- Choi Yoon BumNam Yoon Bum (Ep. 9-10)Guest Role
- Kim Ha NeulJung Soo Jin (Ep. 9-10)Guest Role
- Park Sang HyunLee Yoon Jung (Ep. 10)Guest Role
- Seo Yun HyukWoo Hyung Chul [Child] (Ep. 10)Guest Role
- Kim Ji Su[Hye Won's friend] (Ep. 10)Guest Role
- Yoo Yeon[Hyung Chul's mother] (Ep. 10)Guest Role
- Shin Kang Kyun[Jin Ah's grandfather] (Ep. 10)Guest Role
- Kwon Ye EunYu Na [Bong Yi's neighbor] (Ep. 10-11)Guest Role
- Choi Sol Hee[Yu Na's mother] (Ep. 10-11)Guest Role
- Choi Ji Woo[Restaurant customer] (Ep. 11)Guest Role
- Park Jung Eon[Judge] (Ep. 11)Guest Role
- Moon Hak Jin[Parole officer] (Ep. 11)Guest Role
- Choi Gyo Shik[Man discovers body] (Ep. 12-13)Guest Role
- Ha Seung YounAngela (Ep. 14)Guest Role
- Ko Eun BiAngela [Young] (Ep. 14)Guest Role
- Min Jung SupHan Soo Chul [Gas station worker] (Ep. 14)Guest Role
- Ji Tae YangKim Byung Tae (Ep. 14)Guest Role
- Kim Sung JunMyung Ko Nam (Ep. 14)Guest Role
- Kim Bi Bi[Nun] (Ep. 14)Guest Role
- Lee Yong Nyeo[Student's grandmother] (Ep. 14)Guest Role
- Im Yong Soon[School custodian] (Ep. 14)Guest Role
- Shin Soo HyunMichaela (Ep. 14, 18)Guest Role
- Park Se Ryeon[Nurse] (Ep. 15)Guest Role
- Min Sang Chul[Doctor] (Ep. 16)Guest Role
- Son Seung Hun[Insurance agent] (Ep. 16)Guest Role
- Kim Young Sun[Science teacher] (Ep. 17)Guest Role
- Kwon Oh GeonSung Yo Han [Young] (Ep. 17-18)Guest Role
- Moon Yong IlProsecutor Yoon (Ep. 18)Guest Role
- Kim Yo Han[Young Shin's driver] (Ep. 20)Guest Role
- Kim Yo Han[Post credit scene] (Ep. 20)Guest Role
- Kim Hyo JinBang Yoo HwaGuest Role
- Kim Sang IlDr. Park Min JoonGuest Role
- Lee Seung Hyung[Young Shin's attorney] (Ep. 20)Guest Role
- Kim Eun Jin[Nanny]Guest Role
- Lee Jae Eun[Dong Goo's mother]Guest Role
- Lee Chae HyunHoon Suk [Ba Reum's nephew]Guest Role
- Jun Jung Il[Korean department]Guest Role
- Seo Suk Gyu[Motel OZ agent] (Ep. 15-16)Guest Role
- Park Mi Na[Convenience store woman] (Ep. 10, 16)Guest Role
- Uhm Ja Yoon[Doctor]Guest Role
- Lee Soo Yeon Guest Role
- Kim Su Kyung[Park Jong Ho's sister] (Ep.16,20)Guest Role
Unknown
- Park Jin Soo Unknown
- Lee Ji Yun Unknown
- Baek Bum Suk Unknown
- Im Too Chul Unknown
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