Director
Screenwriter
Main Role
- Seo Ji HoonKim Hwan | Kim Chang Jun [Young]Main Role
- Noh Jong HyunMin Ce InMain Role
- Ahn Ji HoJeong Ho SuMain Role
- Seo Young JooKim Do GeonMain Role
- Kim Yoon WooPark Ha RuMain Role
- Jung Woo JinKim Joo AnMain Role
- Jeon Jin SeoJeon Jae HaMain Role
Support Role
- Jung Sung IlKim Chang Jun [Kim Hwan's father]Support Role
- Kim Nam HeeSong Jun Ho [Chang Jun's secretary]Support Role
- Nam Myung RyulKoo Hyun Bok [Principal]Support Role
- Woo Hee JinHwang Seo Yoon [Jae Ha's mother]Support Role
- Sung Ji Ru[Homeroom teacher]Support Role
- Kim Young WoongKim Seong Hoon [Joo An's father]Support Role
- Lee Hang NaShim Seon Mi [Ha Ru's mother]Support Role
- Yeo WoonChoi Ji Han [Psychiatric patient]Support Role
- Im Chul HyungSeo Sung Tae [Jae Ha's step-father]Support Role
- Park Ji HoonSeo Min Kook [Jae Ha's step-brother]Support Role
- Lee Do YupMin Young Ho [Ce In's father]Support Role
Guest Role
- Moon Jong Ho[Student] (Ep. 1)Guest Role
- Kim Gye SeonKim Jung Hee [Ho Su's aunt] (Ep. 1-2, 5, 8, 10)Guest Role
- Cha Soo RinMrs. Jeong [Do Geon's homeroom teacher] (Ep. 1-3)Guest Role
- Yoon Jung Sub[Teacher] (Ep. 1-2)Guest Role
- Jeon Young[Housekeeper] (Ep. 1, 3, 10)Guest Role
- Park Young Soo[Container owner] (Ep. 1, 5, 8-9)Guest Role
- Chae Yeon Hee[Saleswoman] (Ep. 2)Guest Role
- Nam Da Nu[Thief student] (Ep. 2)Guest Role
- Kim Ji HoonJeong Ho Su [Child] (Ep. 2, 8)Guest Role
- Han Yun JunMin Ce In [Young] (Ep. 2, 4, 7-8, 12)Guest Role
- Kim Ji SungKim Eun Joo [Ce In's mother] (Ep. 2, 4, 6-8, 12)Guest Role
- Nam Jin BokPark Noh Ah (Ep. 3, 5, 8-10)Guest Role
- Jung Hyun JoonPark Ha Ru [Young] (Ep. 3, 5, 8-10)Guest Role
- Kim Bi Bi[Psychiatrist] (Ep. 3, 10, 12)Guest Role
- Kim Tae Yul[Captive kid] (Ep. 3, 5, 8-10)Guest Role
- Jang Joon Ho[Doctor] (Ep. 4)Guest Role
- Lee Yoon JaeByeon Won Joong (Ep. 4-5)Guest Role
- Choi Seung HoonKim Joo An [Young] (Ep. 4, 10, 12)Guest Role
- Shin Yeon SuhKim Eun Hye [Joo An's sister] (Ep. 4, 6, 12)Guest Role
- Won Chun Gyu[Police officer] (Ep. 5)Guest Role
- Kim In Kwon[Police officer] (Ep. 5)Guest Role
- Park Ah SungKim Do Hyun [Do Geon's brother] (Ep. 5-7)Guest Role
- Kang Tae JooPark Sang Min [Ha Ru's brother] (Ep. 6)Guest Role
- Kwak Na Yeon[Ha Ru's neighbor] (Ep. 6)Guest Role
- Lee Shi Hoo[Thug] (Ep. 6-7, 10, 12)Guest Role
- Park YongSeo Jang Won [Chang Jun's party attendee] (Ep. 7)Guest Role
- Park Gi Seon[Churchgoer] (Ep. 7)Guest Role
- Jang Eui Don[Chang Jun's party attendee] (Ep. 7)Guest Role
- Kim Jae Heum[Chang Jun's party attendee] (Ep. 7)Guest Role
- Kim Yoon HoJeong Mi [Student] (Ep. 8)Guest Role
- Jung Hyun Chul[Teacher] (Ep. 8-10)Guest Role
- Won Yun SeoKim Eun Hye [Young] (Ep. 9)Guest Role
- Park Jung Eon[Doctor] (Ep. 9)Guest Role
- Byun Yoon Jeong[Detective] (Ep. 9)Guest Role
- Shin Min Soo[Protester] (Ep. 10)Guest Role
- Kim Yong Jin[Chang Jun's man] (Ep. 10)Guest Role
- Kim Mi Seung[Nurse] (Ep. 10-12)Guest Role
- Jo Seung YeonLee Young Ran [Joo An's mother] (Ep. 10, 12)Guest Role
- Jeong Soo Hyun[Thug] (Ep. 10, 12)Guest Role
- Ki Eun YooKim Hwan [Child] (Ep. 11)Guest Role
- Lee Jae Hak[Bully kid] (Ep. 12)Guest Role
- Park Ok Chool[Do Geon's aunt] (Ep. 12)Guest Role
- Kim Nak Kyun[Do Geon's boss] (Ep. 12)Guest Role
- Lee Seung HyungPark Jin Wook [Ha Ru's father]Guest Role
- Oh Mi HeeSong Nan Young [Do Geon's mother]Guest Role
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