Han Sang Jin as Shin Hyun Woo (Before)
– Bae Soo Bin as Shin Hyun Woo (after) / Ahn Jae Sung
Lee So Yeon as Joo Ah Ran
Kim Tae Hyun as Nam Joo Seung
Hong Soo Hyun as Yoon Jae Hee
Park Ha Young as Jae Hee (child)

Supporting Cast

Han Jin Hee as Shin Woo Sub
Kim Dong Gun as Shin Hyun Min
Jin Ye Sol as Shin Hyun Ji
Cha Hwa Yun as Jo Kyung Hee
Kang Yoo Mi as Kim Yeon Jae
Lee Sung as Nam Bi Seo
Choi Ji Na as Jung Sang Ah / Julie Jung
Lee Jong Hyuk as Jung Sang Mo
Lee Mi Young as (Jae Hee’s aunt)
Jung Gyu Soo as (Jae Hee’s uncle)
Son Hyun Joo as pervert in sauna
Ahn Nae Sang as detective (eps.15-16)
Oh Dae Gyu as fake Shin Woo (ep15)
Oh Young Shil (cameo, ep16)
Choi Joon Yong (cameo, ep16)
Park Chul Min as Kyung Chal
Lee Jae Hwang
Sung Chang Hoon as Secretary Kang
Lee Sul Goo as money lender