Son Ho Joon as Lee Jang Go
– Yoon Chan Young as Lee Jang Go (child)
Im Ji Yun as Kim Mi Poong / Kim Seung Hee
– Lee Young Eun as Kim Mi Poong (Child)
Oh Ji Eun as Park Shin Ae (ep 1-12)
– Im Soo Hyang as Park Shin Ae (from ep 13)
Han Joo Wan as Jo Hee Dong
Hwang Bo Ra as Jo Hee Ra
Jang Se Hyun as Lee Jang Soo

Jang Go’s family

Kim Young Ok as Dal Rae
Geum Bo Ra as Lee Geum Shil
Kim Hee Jung as Nam Yi
Lee Dae Yeon as Lee Kyung Shik

Mi Poong’s family

Lee Il Hwa as Joo Young Ae
Hong Dong Young as Kim Yoo Sung
Han Gab Soo as Kim Dae Hoon

Hee Dong’s family

Byun Hee Bong as Kim Duk Chun
Ban Hyo Jung as Chun Gwi Ok
Lee Hwi Hyang as Ma Chung Ja
Lee Jong Won as Jo Dal Ho
Jung Jong Joon as Jo Eok Man
Son Sook as Soon Ok

Others

Kim Hyun as Kim Soon Boon
Son Chang Min
Seo Kwang Jae
Joo Suk Tae as private investigator (cameo)
Park Sang Hoon
Noh Susanna as Jung Mi
Choi Ri (cameo)
Lee Hyun Kul as Kim Seung Joon