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 Woon Ki [Bok Joo'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 SeonKim 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
- Oh Jin Ha[Nurse]Guest Role
- Kim Hyun Jung[Dormitory housemother] (Ep. 3)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
- Kim Ji Eun[Senior dance]Bit part
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