Pemeran Brain

Shin Ha Kyun (신하균)

as Lee Kang Hoon

Pemeran Utama

Choi Jung Won

as Yoon Ji Hye

Pemeran Utama

Jung Jin Young

as Kim Sang Chul

Pemeran Utama

Jo Dong Hyuk

as Seo Joon Suk

Pemeran Utama

Im Ji Eun

as Hong Eun Suk

Pemeran Pembantu

Lee Seung Joo

as Dong Seung Man

Pemeran Pembantu

Kwak Seung Nam

as Yang Bum Joon

Pemeran Pembantu

Shim Hyung Tak

as Jo Dae Shik

Pemeran Pembantu

Claudia Kim

as Jang Yoo Jin

Pemeran Pembantu

Kim Ga Eun

as Lee Ha Yeong

Pemeran Pembantu

Kang Ye Seo

as Choi Roo Bi

Pemeran Pembantu

Lee Sung Min (이성민)

as Ko Jae Hak

Pemeran Pembantu

Song Ok Sook

as Kim Soon Im

Pemeran Pembantu

Kwon Yul (권율)

as Yeo Bong Goo

Pemeran Pembantu

Ban Hyo Jung

as Hwang Yeong Sun

Pemeran Pembantu

Park Chul Ho

as Park In Bum

Pemeran Pembantu

Jo Soo Min

as Im Hyeon Jeong

Pemeran Pembantu

Ryu Sung Hoon

as Baek Sang Ho

Pemeran Pembantu

Jo Jae Wan

as [Gap Sul's son]

Bintang Tamu

Go In Beom

as [Yoo Jin's father]

Bintang Tamu

Jeon Moo Song

as Kim Shin Woo

Bintang Tamu

Choi Il Hwa

as Ahn Dong Suk

Bintang Tamu

Hong Il Kwon

as Hwang Tae Sung

Bintang Tamu

Kim Young Ok

as Sa Bong Ja

Bintang Tamu

Yoo Chae Young

as [Swimming instructor]

Bintang Tamu

Heo Jung Gyu

as Kong Duk Ki

Bintang Tamu

Lee Chan Ho

as Na Jae Woong

Bintang Tamu

Lee Hyun Woo (이현우)

as Park Dong Hwa

Bintang Tamu

Marco

as [Man at swimming pool]

Bintang Tamu

Go Nak Hyun

as Lee Kang Hoon [Young]

Bintang Tamu

Kim Hyo Won

as Seo Dong Gyun

Bintang Tamu

Hwang Bum Shik

as President Cha Hoon Kyung

Bintang Tamu

Jang Yoon Woo

as [Medical student]

Bintang Tamu

Min Tae Yul

Bintang Tamu

Song Joon Geun

as Deputy Ha

Bintang Tamu

Song Hyun Wook

Sutradara

Yoo Hyun Ki

Sutradara

Moon Joon Ha

Producer

Yoon Kyung Ah

Screenwriter