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
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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 -
Lee Ye Eun[Eun Bi / Eun Byul’s body double]Guest Role -
Ahn Sung HoonDong GuGuest Role -
Kim Yoon Seol[Bus passenger] (Ep.9)Guest Role
Unknown
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Park Seung Joon Unknown
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