Director
Screenwriter
Main Role
- Seo Kang JoonJung Hae Seong / Jung Si HyeonMain Role
- Jin Ki JooO Su A / O Bong JaMain Role
- Kim Shin RokSeo Myeong JuMain Role
Support Role
- Jeon Bae SooAn Seok Ho [NIS team 4 team leader]Support Role
- Jo Bok RaeKo Yeong Hun [NIS team 4 agent]Support Role
- Yoon Ga YiPark Mi Jeong [NIS team 4 agent]Support Role
- Lee Seo HwanKim Hyeong Bae [NIS director]Support Role
- Im Chul HyungKong Jin Sang [NIS team 1 team leader]Support Role
- Kim Min JuLee Ye Na [Student council president]Support Role
- Park Se HyunAn Yu Jeong [Seok Ho’s daughter]Support Role
- Jang Sung BumPark Tae Su [Student council member]Support Role
- Lee Hyun SoHan Seung Jae [Student council member]Support Role
- Kim Sun MinJi Hyeon Jun [Student council vice president]Support Role
- Shin Jun HangLee Dong Min [Student]Support Role
- Jeong Soo HyunIm Yun Cheol [Student]Support Role
- Kang Pil JunSon Beom Sik [Student]Support Role
- Shin Ga EunChoi Su Jin [Student]Support Role
- Kim Seung BeomKim Ho Jin [Informant]Support Role
- Park Jin UPark Jae Mun [Byeongmun high school president]Support Role
- Oh YongBaek Gwang Do [Superintendent]Support Role
- Lee Min JiKim Ri An [P.E. teacher]Support Role
- Noh Jong HyunLee Jun Ho [Math teacher]Support Role
- Kim Young AhIm Cheong Ha [Su A's mother]Support Role
- Kim Soo JinJang Man Ok [Seok Ho's wife]Support Role
Guest Role
- Kim Eui SungSeo Byeong Mun [Byeongmun high school former principal] (Ep. 1)Guest Role
- Li Yong Qun[Blackmarket buyer] (Ep. 1)Guest Role
- Kyung Ki Hyun[Restaurant hoodlum] (Ep. 1)Guest Role
- Oh Eui ShikJung Jae Hyun [Hae Seong's father] (Ep. 1-2, 5-7, 11-12)Guest Role
- Shin Dam SooPark Min Cheol [Assemblyman] (Ep. 1, 3-4)Guest Role
- Kang Soo Bin[Bully student] (Ep. 2)Guest Role
- Jang Se Rim[Bully student] (Ep. 2)Guest Role
- Jo Jae YoonGu Sang Tae [Boss] (Ep. 2-4)Guest Role
- Shin Yeon SukChoi Bok Sun [Dong Min’s grandma] (Ep. 2-3)Guest Role
- Koo Min HyukKim Hyeon Ho [Security guard] (Ep. 2-3, 5-6)Guest Role
- Yu Ji WanJung Hae Seong [Child] (Ep. 2, 4-7, 9, 11-12)Guest Role
- Lee Dong GiKang Seong U [Bully] (Ep. 3)Guest Role
- Yong Jin[Detective] (Ep. 3)Guest Role
- Baek Kil Sung[Seong U’s dad] (Ep. 3)Guest Role
- Park Jung Eon[Student’s mom] (Ep. 3)Guest Role
- Lee Bum Chan[Ye Na’s driver] (Ep. 3, 5)Guest Role
- Su Hyun[Student] (Ep. 4)Guest Role
- Ahn Nae Sang[Neighborhood resident] (Ep. 4)Guest Role
- Park Seol HaO Su A [Child] (Ep. 4-7)Guest Role
- Kwon Tae WonChief editor Yun (Ep. 5)Guest Role
- Kim Sung Yong[CCTV room staff] (Ep. 5)Guest Role
- Lee Hwi Seo[Piano student] (Ep. 6)Guest Role
- Yoo Dam YeonMs. Do [Student’s parent] (Ep. 7-8)Guest Role
- Joo Seok Tae[Seung Jae’s dad] (Ep. 7-8)Guest Role
- AnnePark Min Ji [Su A’s student] (Ep. 8, 12)Guest Role
- Kim Dae Geun[Gang member] (Ep. 10)Guest Role
- Kim Nak Gyun[Internal affairs officer] (Ep. 10)Guest Role
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