Director
Screenwriter
Main Role
-
Hwang Min HyunYun Ga MinMain Role -
Han Ji EunLee Han GyeongMain Role -
Cha Woo MinPi Han UlMain Role -
Lee Jong HyunKim Se HyeonMain Role -
Shin Su HyunLee Ji UMain Role -
Yoon Sang JungChoi Hui WonMain Role -
Gong Do YuLee JunMain Role
Support Role
-
Ju Yeon UKim Sun CheolSupport Role -
Baek Seo HooMa Min Hwan [Yeonbaek Gang]Support Role -
Hong Min GiPark Geon Yeop [1st year student]Support Role -
Park Yoon HoLee Hyeon U [Ji U's twin / 1st year student]Support Role -
Kim Young AhJeon Mi Hyeon [Ga Min's mother / Director of Korean Taekwondo Association]Support Role -
Jung Jae Sung[Vice-principal]Support Role -
Shim Yoon BoNa Tae Man [Detective]Support Role -
Kim Hwi GyuNo. 173Support Role -
Ri Min[Dean of students]Support Role -
Jin Woo JinKim Gyu Jin [Disciplinary Committee member]Support Role -
Seo Min JeKang Tae OSupport Role
Guest Role
-
Lee Jung HyukPi Yeon Baek (Ep. 1)Guest Role -
Kang Du Hyun[Student] (Ep. 1)Guest Role -
Yang Joon Seok[Student] (Ep. 1)Guest Role -
Song Won Su[Security guard] (Ep. 2 )Guest Role -
Kim Min AhHwang Mi Hui (Ep. 3)Guest Role -
Lee Nam GyeongLee Ji U [Child] (Ep. 3)Guest Role -
Jo Yi HyunLee Hyeon U [Child] (Ep. 3)Guest Role -
Kim Dong GyunHwang Do Gyun (Ep. 4)Guest Role -
Song Seung HwanLee Jun [Teen] (Ep. 4)Guest Role -
Kang Ji YongLee Jun [Child] (Ep. 4)Guest Role -
Cho Yi AnAnti [Young teen] (Ep. 4)Guest Role -
Kim MinO Jang Ho [Yeonbaek Gang] (Ep. 4)Guest Role -
Dok Ko Kwang[Pedestrian thug] (Ep. 4)Guest Role -
Lee Chang InNam Sang U (Ep. 4-5)Guest Role -
Ma Hyun JiHong Jae Hui (Ep. 4-5)Guest Role -
Shin Seo WooKim Se Hyeon [Child] (Ep. 4-5)Guest Role -
Lim Ji SubAnti (Ep. 4, 10)Guest Role -
Seo In GeolJang Bi Hwan (Ep. 4, 7)Guest Role -
Kim Jung YoungO Jeong Hwa [Former teacher] (Ep. 4, 9-10)Guest Role -
Mo Geon HuKook Gwan U [Black warehouse 1st grade] (Ep. 4, 7)Guest Role -
Lee Ung JaeYoo Jun Min (Ep. 5)Guest Role -
Lee Keun WookKang Dong Su (Ep. 5)Guest Role -
Lee Dong GiEom Seok Dae (Ep. 5)Guest Role -
Choi Ye ChanKim Ho Min [Child] (Ep. 5)Guest Role -
Kyung Ki Hyun[Delinquent] (Ep. 5)Guest Role -
Lee Jae Yong[Delinquent] (Ep. 5)Guest Role -
Jo Seung Yun[Dean of academic affairs] (Ep. 5, 9-10)Guest Role -
Yang Hee Woo[Driver] (Ep. 6)Guest Role -
Kim Min Chae[Real estate agent] (Ep. 6)Guest Role -
Ko Gyeong Man[Hospital employee] (Ep. 7)Guest Role -
Kang YoonChae Seon Ho (Ep. 7-8)Guest Role -
Park Jae HwiKim Jae Seung (Ep. 7-8)Guest Role -
Kim Nak GyunChu Seong Ung (Ep. 7-8)Guest Role -
Kim Sung Ho[Guard] (Ep. 7-8)Guest Role -
Jeon Moo Song[Sun Cheol’s grandfather] (Ep. 7-8)Guest Role -
Oh Han KyulPark Geon Yeop [Child] (Ep. 9)Guest Role -
Seo Soo Min[Student] (Ep. 9)Guest Role -
Ma Jung Pil[Hui Won’s dad] (Ep. 9)Guest Role -
Kim Mi Ra[Hui Won’s mother] (Ep. 9)Guest Role -
Park JinBang Sang In (Ep. 9-10)Guest Role -
Lim Su Hwan[Secretary] (Ep. 9-10)Guest Role -
Kang Ji Hoon[Anchorman] (Ep. 9-10)Guest Role -
Park Jun HyukAnti [Teen] (Ep. 10)Guest Role -
Jang Joo YoungKim Ho MinGuest Role -
Lee Jong WookPark Jung NamGuest Role -
Park Jung HoonHeo Jeong MinGuest Role -
Choi Seung HoonYun Ga Min [Teen]Guest Role -
Jang Sun YoolYun Ga Min [Child]Guest Role -
Han Jung HoonPark Min Cheol [3rd student]Guest Role -
Park Jun Woo[Bully]Guest Role -
Shin Min Soo[Custodian]Guest Role -
Jang Eui Don[Superintendent]Guest Role -
Kim Young Woong[Se Hyeon's father]Guest Role -
Lee Young Joon[Yusung tech student]Guest Role -
Seo Dong Kyu[Yusung tech student]Guest Role
Cameo
-
Lee Jong HyukPi Yeon Baek [Han Ul's father]Cameo -
Yoo In SooChu Jae Hwang [Student] (Ep. 9-10)Cameo
Unknown
-
Lee Ryu Min Unknown
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