Main Role
- Ahn Seo Hyun Main Role
- Ji Min Hyuk Main Role
Support Role
- Song Soo HyunBae Shin Ae [Ji Na's best friend]Support Role
- Kim Ji YoungOh Sana [Ji Na's younger sister}Support Role
- Jin Geon UHo Go Joon [Doctor]Support Role
- Sung Ji RuO Gang Dong [O Ji Na's father]Support Role
- Kim So HeeGeum Soo JiSupport Role
- Park Seo YeonJeong Bo RaSupport Role
- Seo Yoo RiKim Seon Hee [Ji Na and Sa Na's aunt]Support Role
- Park Hee JinKim Eun Hee [Ji Na and Sa Na's mother]Support Role
- Hyun Woo SungSa Gi JunSupport Role
- Kim Ye EunMaeng Sa RangSupport Role
- Lee Joon YoungKang Ha JoonSupport Role
- Jung Jung AhJung Jung AhSupport Role
- Jo Young SeonNa Na RiSupport Role
- Park Dong BinLee Dae Ro [Principal teacher]Support Role
- Choi Ki Seob[Teacher]Support Role
- Hwang Tae Kwang[P.E. Teacher]Support Role
- Ju Yeon U[Art teacher]Support Role
- Seo Ji Won[Bully]Support Role
- Yoon Ah JungGo Min JooSupport Role
- Lee Ji HyunHa Rok HeeSupport Role
- Yoo Jae SangOh Gun WooSupport Role
- Shin Jun HangAhn Mi NamSupport Role
Guest Role
- Jung Da EunBaek Song Yi (Ep. 2)Guest Role
- Shin Ji HoonCho Eun Yeon (Ep. 3-4)Guest Role
- Lee Young EunBan Ha Ni (Ep. 11-12)Guest Role
- Jung Min GyuDo Min [Student Council]Guest Role
- Kwon Min A[Herself]Guest Role
- Ahn Sang Tae[Shaman]Guest Role
- Jo Jae Yoon[Rok Hee's dad]Guest Role
- Kim Deok Soo[Shin Ae's stalker tutor]Guest Role
- Kam Rain[Wedding Hall Manager]Guest Role
- Shin Bong Sun Guest Role
- Park Soo Yeon Guest Role
- Lee Moo Nyoung[Prisoner]Guest Role
- Park Yoon Young[Ji Na's friend](Ep. 9)Guest Role
- Kwon Yoo Na[Female student]Guest Role
- Park Ji HuLee Ha YanGuest Role
- Koo Ji HyeMo Ra HaeGuest Role
- Jo Jung EunPark Saem NaGuest Role
- Im Jae HaSong Jong KiGuest Role
- Lee Do HyungHyun WooGuest Role
Bit part
- Shin Ji Yeon['Baby' group confront Sa Gi Jun]Bit part
- Da Seul Bit part
Unknown
- Woo Kang Min Unknown
- Nam Dae Jung Unknown
- Kang Yeo Jung Unknown
- Kim Seo Yeon Unknown
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