It's Okay to Not Be Okay

Kim Soo-hyun

Moon Gang-tae

Seo Yea-ji

Ko Moon-young

Oh Jung-se

Moon Sang-tae

Park Gyu-young

Nam Joo-ri

Kim Ju-hun

Lee Sang-in

Jang Young-nam

Park Haeng-ja

Kang Ki-doong

Jo Jae-soo

Kim Chang-wan

Oh Ji-wang

Park Jin-joo

Yoo Seung-jae

Jang Gyu-ri

Sun-byeol

Kim Mi-kyung

Kang Soon-duk

Lee Eol

Ko Dae-hwan

Kim Ki-cheon

Kan Pil-wong

Lee Kyu-sung

Young Moon Sang-tae

Choi Woo-sung

Oh Cha-yong

Jeong Jae-kwang

Joo Jung-tae

Chi Hae-won

Lee A-reum

Joo In-young

Yoo Sun-hae

Bae Hae-sun

Kang Eun-ja

Kim Su-in

Young Ko Moon-young

Choi Hee-jin

Kang-tae & Sang-tae's Mother

Kang Ji-eun

Park Ok-ran

Moon Woo-jin

Young Moon Gang-tae

Kwak Dong-yeon

Kwon Ki-do

Woo Jeong-won

Do Hee-jae

Seo Joon

Kwon Min-seok

Lee Young-sook

Kwon Man-su's Wife

Han Gi-joong

Kwon Man-su

Kang Woo-je

Kwon Man-su's Assistant

Park Seo-kyung

Child Nam Joo-ri

Kwon Ha-young

Kang Eun-ja's Daughter

Bae Yu-ri

Man-su's Daughter

Jung Ji-hwan

Publishing Staff

Jung Ji-hyeon

Publishing Staff

Ko Han-min

Publishing Staff

Ryu Yeon-seok

Publishing Staff

Cheon So-Ra

Publishing Staff

Daniel Choi

CEO Choi Daniel

Jung Sang-hoon

Motel Clerk

Bae Bo-ram

Myoung Ji-Suk

Cho Si-yeon

Lee Seul-bi

Min Young

Lee Seul-bi's Mother

Kim Jin

Nurse

Son Kang-gook

Kim Seung-cheol

Kwon Ye-Eun

Go-eun

Kim Woo-kyum

Caregiver

Kim Tae-hoon

Doctor

Yoo Seung-il

Angry Professor

Jung Seung-kil

Book Critic

Kim Geon-ho

Book Signing Parent

Lee Ji-hae

Book Signing Parent

Jo Yi-hyun

Dinosaur Boy

Kwon Dong-ho

Lee Ah-reum's Ex-husband

이화영

Lee Ah-reum's Mother

Jeon Jun-woo

Lee Ah-reum's Brother

Lee Sun-Young

Nurse

Min Kyung-jin

Yoo Sun-hae's Father

Bae Sung-il

Detective

Kim Yun-seul

Kindergarten Girl

Choi Se-in

Kindergarten Girl

Kim Sang-il

Admin Manager

Park Chul-Min

TV Reporter

Yu Mi-ran

Landlord