When I Sleep

Jeong Ji-in

as

Sun-ah

Oh Woo-ri

as

Ji-soo

Park Bo-ram

as

Bo-mi

Lee Han-ju

as

Byeong-jae

Kim Young-pil

as

Dae-ho

Kim Ju-hun

as

Hae-soo

Lee Sang-hee

as

Su-jin

Han Ji-won

as

Su-yeon

Baek Hyun-joo

as

Jung-hee

Seo Sang-won

as

Sun-ah's father

Yang Mal-bok

as

Bo-mi's mother