Director
Main Role
- Ahn Ji HoLee Hui SuMain Role
- Lee Sang JunKim Seung WonMain Role
- Cho Jun YoungJu Chan YeongMain Role
- Kim Do YeonChoi Ji YuMain Role
Support Role
- Jeon Yeong InSin Ho Sik [Hui Su's classmate]Support Role
- Kim Han NaLee Hui Jeong [Hui Su's sister]Support Role
- Park Kyung HyeLee Hui Jae [Hui Su's sister]Support Role
- Jung Ye NokLee Hui Sin [Hui Su's sister]Support Role
- Yeon Si WooCha So Hui [Student from class 4]Support Role
Guest Role
- Baek Na GyeongLee Jin Hwa (Ep. 1)Guest Role
- Jo Yoon JooChoi Jeong In (Ep. 1)Guest Role
- Ko Kyu PilKim Jeong Myeong [Earth science teacher] (Ep. 1, 7)Guest Role
- Park Yoo HyunJi Yeon (Ep. 1)Guest Role
- Kim Yun Ha[School bully] (Ep. 1)Guest Role
- Yang Jung Ah[Seung Won's mother] (Ep. 2, 5, 7)Guest Role
- Kim Shi HooJu Do Yeong [Chan Yeong's brother] (Ep. 2)Guest Role
- Park Jung YeonDokgo Hui Won (Ep. 2, 4, 7)Guest Role
- Choi Rak Yeong[Councelling club member] (Ep. 2)Guest Role
- Sin Ga Ram[Councelling club member] (Ep. 2)Guest Role
- Choo Ye JinSong Yu Jin (Ep. 3, 5)Guest Role
- Jang Sung BumJeong Gu [Hui Jae's boyfriend] (Ep. 3)Guest Role
- Woo Yeon Seo[Cafe owner] (Ep. 3)Guest Role
- Lee Jong Wook[Gym teacher] (Ep. 3-4)Guest Role
- Sung Ki Yoon[Chan Yeong's dad] (Ep. 4-5, 8)Guest Role
- Jung Hyung Suk[Tennis club coach] (Ep. 4-5, 7-8)Guest Role
- Kwak Yeong Seon[Seung Won's father] (Ep. 5)Guest Role
- Park Chae Yun Guest Role
Unknown
- Oh Tae Eun Unknown
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