"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
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
