Cinematography
Composer
Director
Executive Producer
Screenwriter
Main Role
- Kim So Hyun Main Role
- Nam Joo Hyuk Main Role
- Yook Sung Jae Main Role
Support Role
- Lee Pil MoKim Joon Seok [Teacher]Support Role
- Jo Soo HyangKang So YeongSupport Role
- Kim Hee JungCha Song JooSupport Role
- Lee Cho HeeLee Shi JinSupport Role
- David LeePark Min JoonSupport Role
- Park Doo ShikKwon Gi TaeSupport Role
- Lee Hwa KyumJo He NaSupport Role
- Kim Bo RaSeo Young EunSupport Role
- Kim Min SeokMin SeokSupport Role
- Kim Jung NanShin Jung Min [Min Joon's mother]Support Role
- Kim Se AhShin Yi Yeong [Shi Jin's mother]Support Role
- Jeon Mi SeonSong Mi Kyung [Eun Byul's mother]Support Role
- Park Ah SungAh SungSupport Role
- Lee Dae YeonHan Gi Choon [Yi An's father]Support Role
- Jeon Noh MinGong Jae Ho [Tae Kwang's father]Support Role
- Jung In KiPark Joon Hyung [Min Joon's father]Support Role
- Jo Duk HyunKang Il San [So Yeong's father]Support Role
- Lee Hee Do[Vice Principal]Support Role
- Shin Jung Keun[Student Supervisor]Support Role
- Jung Jae Eun[So Yeong's mother]Support Role
- Jang In SubSeong Yoon JaeSupport Role
- Choi Hyo EunHyo EunSupport Role
- Lee Seung HoHimselfSupport Role
- Kim Min YoungLee Soo Mi [So Yeong's friend]Support Role
- Lee Shi WonJung Min Young [Soo In's sister]Support Role
- Choi Dae Chul[Swim team coach]Support Role
- Jung Soo YoungAn Joo RiSupport Role
- Lee Jae InRa JinSupport Role
- Park Hwan HeeKyeong JinSupport Role
- Ji Ha YoonHa YoonSupport Role
- Han Sung YunSung YeonSupport Role
- Oh Woo JinWoo JinSupport Role
- Oh Yoon Hong[Soo In's mother]Support Role
- Jung In SeoJung Soo In (Ep. 12)Support Role
- Yoo Yeon MiYeon Mi JooSupport Role
- Kwon Eun SooEun SooSupport Role
- Kim Min Gue[Swimming Team Member]Support Role
- Lee Kang Min[Swimming club senior]Support Role
- Cho Byeong KyuByeong GyooSupport Role
- Lee Jung Eun[Young Eun's mother] (Ep. 2-3)Support Role
- Lee Jin KwonJin KwonSupport Role
Guest Role
- Park Young Soo[Karaoke owner] (Ep. 2)Guest Role
- Choi Soo Rin[Tae Gwang's mother]Guest Role
- Bae Soo BinKim Seul Yeong (Ep.16) [Teacher]Guest Role
- Sam HammingtonHimself (Ep. 15) [English Teacher]Guest Role
- Yang Hee KyungPark Min Kyung (Ep.1 & 4)Guest Role
- Ko Woo RimHan Yi An [Child]Guest Role
- Kim Ga Young[School uniform model] (Ep. 6)Guest Role
- Kim Jin Yi[Health teacher]Guest Role
- Oh Hee Joon[Food delivery man] (Ep. 9)Guest Role
- Kim Gwang In Guest Role
- Kim Ye JunGong Tae Kwang [Young]Guest Role
- Jung Ye Nok[Secret private lesson student]Guest Role
- Yeo Woon[School team swimmer] (Ep. 2, 5, 11, 16)Guest Role
- Kang Ji WooLee Eun Bi / Go Eun Bi / Go Eun ByulGuest Role
- Ahn Won Jin Guest Role
- Seo Dong HyunShi WooGuest Role
- Ahn Sung HoonDong GuGuest Role
- Kim Yoon Seol[Bus passenger] (Ep.9)Guest Role
- Lee Ye Eun[Eun Bi / Eun Byul’s body double]Guest Role
Unknown
- Park Seung Joon Unknown
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