Chief Producer
Composer
Director
Screenwriter
Main Role
-
Lee Sung Kyung Main Role -
Nam Joo Hyuk Main Role -
Lee Jae Yoon Main Role -
Kyung Soo Jin Main Role
Support Role
-
Cho Hye JungJung Nan Hee [Bok Joo's best friend]Support Role -
Lee Joo YoungLee Sun Ok [Bok Joo's best friend]Support Role -
Ji Il JooJo Tae Kwon [Joo Hyeong's best friend]Support Role -
Yoo Joon HongJung Woo [Bok Joo's sunbae]Support Role -
Jang Young NamChoi Sung Eun [Bok Joo's coach]Support Role -
Yoo Da InGo Ah Yeong [Jae Yi's friend]Support Role -
Jo Soo HyangSoo Bin [Shi Ho's teammate]Support Role -
Kang Ki YoungKim Dae Ho [Bok Joo's uncle]Support Role -
Moon Ji YoonSung Chul [Bok Joo's sunbae]Support Role -
Ray YangSung Yoo Hee [Shi Ho's coach]Support Role -
Oh Eui ShikBang Un Gi [Bok Ju's sunbae]Support Role -
Ahn Kil KangKim Chang Gul [Bok Joo's father]Support Role -
Choi Moo SungYoon Deok Man [Bok Joo's professor]Support Role -
Jung In Ki[Joon Hyeong's uncle]Support Role -
Lee Jung Eun[Joon Hyung's aunt]Support Role -
Park Won Sang[Joon Hyeong's therapist]Support Role -
Choi WoongKim Ki Suk [Joon Hyeong's sunbae]Support Role -
Z HeraSong Shi Yeon [Shi Ho's sister]Support Role -
Kim Chae Eun[Nurse]Support Role -
Kim Ye JunJung Joon Hyung [Young]Support Role -
Jung Eugene[Rhythmic gymnastics team]Support Role -
Jung Hyun Seok[Dormitory housemaster]Support Role -
Lee Ji Hoon[Swimming team coach]Support Role -
Lee Ye BinLee Ye BinSupport Role -
Lee Ji WooKim Bok Joo [Young]Support Role
Guest Role
-
Kim Jae HyunKim Jae Hyeon [Joon Hyung's junior in swimming team]Guest Role -
Lee Jong SukJong Suk [Chicken Restaurant Customer] (Ep. 2)Guest Role -
Kim Ji Soo[Guy who works with Bok Joo] (Ep. 11)Guest Role -
Kim Woo HyeokKim Woo Hyuk [Joon Hyung's junior in swimming team]Guest Role -
Lee Jong HwaChoi Tae Hoon (Ep. 1 & 15)Guest Role -
Kim Min Ho[Weightlifter] (Ep. 2)Guest Role -
Seo HyunHwan Hee [Jae Yi's ex-girlfriend] (Ep. 12)Guest Role -
Yoon Yoo SunKim Jong Yeon [Joon Hyeong's mom]Guest Role -
Min Sung WookSang Gu [Jae Yi's sunbae] (Ep. 12)Guest Role -
Kim Seul GiSeul Gi [Delivery girl] (Ep. 15)Guest Role -
Byeon Woo SeokJoon Hyung's senior (Ep. 16)Guest Role -
Noh Woo Jin[Bok Ju's senior from Hope House]Guest Role -
Lee Soo JiGoo Seul (Ep. 1)Guest Role -
Oh Ha Nee[Rhythmic gymnast]Guest Role -
Ahn Il Kwon[Bar fight combatant] (Ep. 3)Guest Role -
Kim Ga Eul[Bok Joo's friend]Guest Role -
Seo Kwang JaeDean Kim Kyung MinGuest Role -
Tae Won Seok Guest Role -
Yoo Dam Yeon Guest Role -
Lee Ha Eun[Group date] (Ep. 9)Guest Role -
Kwon Hyuk Bum Guest Role -
Kim Gun[Joon Hyung's elementary school classmate] (Ep. 2)Guest Role -
Hwang Dong Hee[Athletic club]Guest Role -
Yoo Young Bin Guest Role -
Kim Seo Ha[Athletic Team Captain]Guest Role -
Yoon Sung Woo[Clever boy]Guest Role -
Kim Soo In[Young girl doing rhythmic gymnastics]Guest Role -
Shin Ah Young[Announcer]Guest Role -
Kim Nam WooNam WooGuest Role -
Park Kyu Yeop Guest Role -
Kim Ji Eun[Dance senior]Guest Role -
Kim Hyun Jung[Dormitory housemother] (Ep. 3)Guest Role -
Oh Jin Ha[Nurse]Guest Role
Unknown
-
Dong Yoon Seok Unknown -
Park Geon Rak Unknown -
Jo Mi Nyeo Unknown -
Ok Joo Ri Unknown -
Jo Shi Nae Unknown -
Seo Wang Seok Unknown -
Lee Gyoo Jung Unknown -
Han Seo Yeon Unknown
Bit part
-
Ju Seo Eun Bit part
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