Kim Soo Hyun as Baek Hyun Woo
Kim Ji Won as Hong Hae In
Park Sung Hoon as Yoon Eun Seong
Kwak Dong Yeon as Hong Soo Cheol
Lee Joo Bin as Cheon Da Hye

Supporting Cast

Kim Gab Soo as Hong Man Dae [Hae In’s grandfather]
Lee Mi Sook as Mo Seul Hee [Man Dae’s girlfriend]
Jung Jin Young as Hong Beom Jun [Hae In’s dad]
Na Young Hee as Kim Seon Hwa [Hae In’s mother]
Kim Jung Nan as Hong Beom Ja [Hae In’s aunt]
Jeon Bae Soo as Baek Du Gwan [Hyun Woo’s dad]
Hwang Young Hee as Jeon Bong Ae [Hyun Woo’s mom]
Kim Do Hyun as Baek Hyun Tae [Hyun Woo’s older brother]
Jang Yoon Ju as Baek Mi Sun [Hyun Woo’s older sister]
Kim Dong Ha as Baek Ho Yeol [Hyun Tae’s son]
Kim Joo Ryoung as Grace Ko [Secretary]
Yoon Bo Mi as Secretary Na [Hae In’s secretary]
Moon Tae Yu as Kim Yang Gi [Hyun Woo’s friend]
Jung Ji Hwan as [Hyun Woo’s secretary]
Kim Young Min as Yeong Song
Lee Soo Ji as Bang Sil
Park Jung Pyo as Chun Sik
Park Sung Yun as Kang Mi
Lee Ji Hye as Hyun Jeong
Park Yoon Hee