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)