Jun Ji Hyun as Chun Song Yi
– Kim Hyun Soo as Chun Song Yi (young)
Kim Soo Hyun as Do Min Joon
Park Hae Jin as Lee Hwi Kyung
– Jo Seung Hyun as Lee Hwi Kyung (young)
Yoo In Na as Yoo Se Mi
– Kim Ye Won as Yoo Se Mi (young)

Supporting Cast

People around Chun Song Yi

Na Young Hee as Yang Mi Yun (Song Yi’s mother)
Uhm Hyo Sup as Chun Min Goo (Song Yi’s father)
Ahn Jae Hyun as Chun Yoon Jae (Song Yi’s younger brother)
Hong Jin Kyung as President Hong (Manhwabang owner)

People around Do Min Joon
Kim Chang Wan as Jang Young Mok (lawyer)

People around Lee Hwi Kyung

Shin Sung Rok as Lee Jae Kyung (heir of S&C Group)
Lee Jung Gil as Lee Bum Joong (chairman of S&C Group)
Sung Byung Sook as Hong Eun Ah (Hwi Kyung’s mother)
Lee Yi Kyung as Lee Jae Kyung’s secretary
Kim Hae In as Yang Min Joo (Jae Kyung’s ex-wife)

People around Yoo Se Mi

Lee Il Hwa as Han Sun Young
Oh Sang Jin as Yoo Yoo Suk (Se Mi’s older brother)

Others

Kim Kang Hyun as Yoon Bum (Song Yi / Se Mi’s manager)
Kim Bo Mi as Min Ah (Song Yi / Se Mi’s stylist)
Jo Hee Bong as CEO Ahn Dong Min
Kim Hee Won as Park Byung Hee (Detective Park)
Yoo Young Jin as Assistant Manager Yoo
Jung Soo In as Han Yoo Sun (Han Yoo Ra’s younger sister)
Kim Byung Choon as S&C Group staff
Nam Chang Hee as Hyeok
Jang Sung Bum
Choi Dae Sung