Pemeran Dr. Champ

Kim So Yeon

as Kim Yeon U

Pemeran Utama

Jung Gyu Woon

as Park Ji Heon

Pemeran Utama

Uhm Tae Woong

as Lee Do Wook

Pemeran Utama

Cha Ye Ryun

as Kang Hee Young

Pemeran Utama

Ma Dong Seok (마동석)

as Oh Jung Dae

Pemeran Pembantu

Kim Hyung Bum

as Choi Ham Shik

Pemeran Pembantu

Cha Do Jin

as Go Beom

Pemeran Pembantu

Jung Suk Won

as Yoo Sang Bong

Pemeran Pembantu

Lee Si Eon (이시언)

as Heo Taek Woo

Pemeran Pembantu

Shin Dong

as Kang Woo Ram

Pemeran Pembantu

Kang Ki Hwa

as Ko Eun Mi

Pemeran Pembantu

Go In Beom

as Wang Tae Yeon

Pemeran Pembantu

Jung Eui Gab

as Choi Dae Seop

Pemeran Pembantu

Yoon Bong Gil

as Eom Dong Ho

Pemeran Pembantu

Kang So Ra (강소라)

as Kwon Yoo Ri

Pemeran Pembantu

Seo Hyun Suk

as Chae Eun Seok

Pemeran Pembantu

Kim Ga Eun

as Pi Jung Ah

Pemeran Pembantu

Moon Hee Kyung

as Ko Mi Ja

Pemeran Pembantu

Song Seo Yeon

as Lee Suk Ran

Pemeran Pembantu

Heo Jun Seok

as Kim Kyung Woo

Pemeran Pembantu

Ha Eun Seol

Pemeran Pembantu

Yoo Hyun Soo

as [Yeon Woo's ex boyfriend]

Pemeran Pembantu

Hwang Jung Seo

as Nurse

Pemeran Pembantu

Yeom Dong Hun

as Jeong Ho Chang

Pemeran Pembantu

Min Hyo Rin

as [Nurse] (Ep.16)

Bintang Tamu

Onew

as [Doctor] (Ep. 16)

Bintang Tamu

Kim Byung Man

as Im Ki Man

Bintang Tamu

Jo Min Ki

as Dr. Seo

Bintang Tamu

Park Woo Cheon

as national swimming team coach

Bintang Tamu

Han Bo Bae

as Jo Min Ji (Ep. 1)

Bintang Tamu

Ham Jin Sung

as [Monster team handball player]

Bintang Tamu

Ko Jun

as Chang Soo (Ep. 8)

Bintang Tamu

Kim Jae Hong

as [Gym trainee]

Bintang Tamu

Park Hyung Ki

Sutradara

Noh Ji Sul

Screenwriter