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