Son Ye-jin

as Yoo Mi-ho / Lee Ji-ah

Han Suk-kyu

as Han Dong-soo

Go Soo

as Kim Yo-han

Lee Min-jung

as Lee Si-yeong

Park Sung-woong

as Cha Seung-jo

Cha Hwa-yeon

as Seo Hae-yeong

Jung Jin

as Park Tae-ho

Im Ji-gyu

as Yak-tong

Bang Joong-Hyun

as Jo Min-woo

Son Ji-na

as Park Mi-yeon

Joo Ah-reum

as Lee Ji-ah (young)

Ye Su-jeong

as Aunt

Han Ye-won

as Na-hyeon

Kim Ji-hyeon

as Hong Yun-mi (uncredited)

Jo Kyung-sook

as Yang Mi-sook (uncredited)

Choi Jin-ho

as Kim Si-hoo (uncredited)

Jeong In-gi

as Kang Jae-doo (uncredited)

Seo Dong-soo

as Crime lab investigation team leader (uncredited)