It's Okay to Not Be Okay

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