Pemeran It's Okay to Not Be Okay

Kim Soo Hyun (김수현)

as Moon Gang Tae

Pemeran Utama

Seo Yea Ji (서예지)

as Ko Mun Young

Pemeran Utama

Oh Jung Se

as Moon Sang Tae

Pemeran Utama

Park Jin Joo (박진주)

as Yoo Seung Jae

Pemeran Pembantu

Jang Gyu Ri

as Seon Byul [OK Psychiatric Hospital nurse]

Pemeran Pembantu

Kim Ki Cheon

as Kan Pil Ong [Patient]

Pemeran Pembantu

Jung Jae Kwang (정재광)

as Joo Jung Tae [Patient]

Pemeran Pembantu

Ji Hye Won

as Lee Ah Reum [Patient]

Pemeran Pembantu

Choi Woo Sung (최우성)

as Oh Cha Yong [OK Psychiatric Hospital caregiver]

Pemeran Pembantu

Seo Joon

as Kwon Min Seok [OK Psychiatric Hospital psychiatrist]

Pemeran Pembantu

Kang Ji Eun

as Park Ok Ran [Patient]

Pemeran Pembantu

Joo In Young

as Yoo Sun Hae [Patient]

Pemeran Pembantu

Kim Su In

as Go Moon Young [Young]

Pemeran Pembantu

Moon Woo Jin

as Moon Gang Tae [Young]

Pemeran Pembantu

Lee Kyu Sung

as Moon Sang Tae [Young]

Pemeran Pembantu

Jung Ji Hyun

as [Publishing House staff]

Pemeran Pembantu

Cheon So Ra

as [Publishing House staff]

Pemeran Pembantu

Go Han Min

as [Publishing House staff]

Pemeran Pembantu

Yu Yeon Seok

as [Publishing House staff]

Pemeran Pembantu

Bae Bo Ram

as Myoung Ji Suk [Patient] (Ep. 1)

Bintang Tamu

Son Kang Gook

as Kim Seung Cheol [Patient] (Ep. 1)

Bintang Tamu

Kim Jin

as [Nurse] (Ep. 1)

Bintang Tamu

Lee Sun Young

as [Nurse] (Ep. 1)

Bintang Tamu

Kim Tae Hoon

as [Doctor] (Ep. 1)

Bintang Tamu

Kim Woo Kyum

as [Caregiver] (Ep. 1)

Bintang Tamu

Kim Sang Il

as [Admin manager] (Ep. 1)

Bintang Tamu

Yu Seung Il

as [Angry professor] (Ep. 1)

Bintang Tamu

Jung Seung Kil

as [Book critic] (Ep. 2)

Bintang Tamu

Park Chul Min

as [TV reporter] (Ep. 2)

Bintang Tamu

Jo Yi Hyun

as [Dinosaur boy] (Ep. 2)

Bintang Tamu

Kim Geon Ho

as [Book signing parent] (Ep. 2)

Bintang Tamu

Lee Ji Hae

as [Book signing parent] (Ep. 2)

Bintang Tamu

Han Ki Joong

as Kwon Man Su (Ep. 3-4)

Bintang Tamu

Bae Hae Seon

as Kang Eun Ja [Patient] (Ep. 4-7, 16)

Bintang Tamu

Park Seo Kyung

as Nam Ju Ri [Young] (Ep. 5, 9)

Bintang Tamu

Jung Sang Hoon (정상훈)

as [Motel clerk] (Ep. 5)

Bintang Tamu

Choi Se in

as [Kindergarten girl] (Ep. 11)

Bintang Tamu

Kim Yun Seul

as [Kindergarden girl] (Ep. 11)

Bintang Tamu

Bae Seong Il

as [Detective] (Ep. 15)

Bintang Tamu

Kim Jong Ho

as Im Ui Won

Bintang Tamu

Go Do Yeon

as Yoo Sun Hae [Young]

Bintang Tamu

Park So Young

as [Nurse]

Bintang Tamu

Jung Ji Hwan

as [Publishing co. staff]

Bintang Tamu

Kim Dong Hyun

Bintang Tamu

Kim Seong In

Bintang Tamu

Kim Dong Young

Cinematography

Nam Hye Seung

Composer

Park Sang Hee

Composer

Cho Sang Kyung

Costume Designer

Park Shin Woo

Sutradara

Jung Dong Yoon

Sutradara

Yang Gil Yeong

Martial Arts Director

Kim Yoon Jin

Producer

Jo Yong

Screenwriter