It's Okay to Not Be Okay: Cast
Kim Soo-hyun
Moon Gang-tae
Seo Yea-ji
Ko Moon-young
Park Gyu-young
Nam Joo-ri
Oh Jung-se
Moon Sang-tae
Kim Ju-hun
Lee Sang-in
Kim Chang-wan
Oh Ji-wang
Jang Young-nam
Park Haeng-ja
Kim Mi-kyeong
Kang Soon-deok
Kang Ki-doong
Jo Sae-joo
Park Jin-joo
Yoo Seung-jae
Kang Ji-eun
Park Ok-ran
Kim Ki-cheon
Kan Pil-ong
Jeong Jae-kwang
Joo Jeong-tae
Ji Hye-won
Lee Ah-reum
Joo In-young
Yoo Sun-hae
Lee Eol
Go Dae-hwan
Choi Woo-sung
Oh Cha-yong
Choi Hee-jin
Kang-tae and Sang-tae's Mother
Jang Gyu-ri
Seon-byul
Kim Su-in
Young Go Moon-young
Moon Woo-jin
Young Moon Gang-tae
Lee Kyu-sung
Young Moon Sang-tae
Seo Joon
Kwon Min-seok
Ha Kyoung-min
Psychiatrist at OK Psychiatric Hospital
Jung Ji-hyeon
Publishing House Staff
Cheon So-Ra
Publishing House Staff
Yu Yeon Seok
Publishing House Staff
Jung Ji-hwan
Publishing Co. Staff
Ko Han-min
Publishing House Staff