"Two men and two women, their relationship begins in tragic fates, and it grows into love, agony, and parting."
Song Seung-heon
as Yoon Jun Seo
Song Hye-kyo
as Yoon Eun Seo / Choi Eun Seo
Won Bin
as Han Tae Seok
Han Chae-young
as Choi Sin Ae / Yoon Sin Ae
Han Na-na
as Shin Yu Mi
Choi Woo-hyuk
as Yoon Jun Seo (Young)
Moon Geun-young
as Yoon Eun Seo (Young)
Lee Ae-jung
as Choi Sin Ae (Young)
Sunwoo Eun-Sook
as Im Gyeong Ha
Jeong Dong-hwan
as Professor Yoon
Lee Han-wi
as Yoon Ji Hwan
Kim Hae-sook
as Kim Soon Im
Kim Na-woon
as Kim Mun Jeong
Kim Hyeong-jong
as Choi Jong Cheol
Seo Yoon-jae
as Lee Gang Hee
Ahn Seo-jung
as Jae Gyeong
Lee Hyung-min
Executive Producer
Yoon Seok-ho
Director
