It's Okay to Not Be Okay

Kim Soo-hyun

Moon Gang-tae

Seo Yea-ji

Ko Moon-young

오정세

Moon Sang-tae

박규영

Nam Joo-ri

최다니엘

CEO Choi Daniel

정상훈

Motel Clerk

곽동연

Kwon Ki-do

Bae Hae-sun

Kang Eun-ja

배보람

Myoung Ji-Suk

우정원

Do Hee-jae

조시연

Lee Seul-bi

민영

Lee Seul-bi's Mother

김진

Nurse

Son Kang-gook

Kim Seung-cheol

Kwon Ye-Eun

Go-eun

김우겸

Caregiver

김태훈

Doctor

유승일

Angry Professor