Full cast of Good Boy

Park Bo-gum

Yun Dong-ju

16 episodes

Kim So-hyun

Ji Han-na

16 episodes

Oh Jung-se

Min Joo-young

16 episodes

Lee Sang-yi

Kim Jong-hyeon

16 episodes

Heo Sung-tae

Ko Man-sik

16 episodes

Tae Won-seok

Shin Jae-hong

16 episodes

Seo Hyun-chul

Hwang Kyeong-cheol

16 episodes

Jeong Man-sik

Oh Jong-gu

16 episodes

Park Chul-min

Kim Geum-nam

16 episodes

Jung Seo-yeon

Jung Mi-ja

16 episodes

Eung-soo Kim

Cho Pan-yeol

16 episodes

Lee Ji-hyeon

Jung Gyeong-mi

16 episodes

Go Joon

Leo

16 episodes

Kim Ji Yoo

Ji Han-na [young]

16 episodes

Lee Ho-jung

Kim Yeon-ha / Drug Monster

12 episodes

Kim Eung-soo

Jo Pan-yeol

3 episodes

Han Kyu-won

An Dae-yong

3 episodes

Park Jeong-woo

Gangster

3 episodes

Park Cheol-min

Kim Geum-nam

3 episodes

Lee Ji-hye

Jung Kyung-mi

2 episodes

Lee Dal

Silver Bunny

2 episodes

Na Ho-sook

Lee Jin-su's Mom

2 episodes

Lee Jung-ha

Lee Gyeong-il

2 episodes

Seo Jeong-yeon

Jeong Mi-ja

2 episodes

Ahn Se-ho

Baek Suk-choon

2 episodes

Kang Gil-woo

Lee Sang-gon

2 episodes

Lee Han-sol

Lee Jin-su

2 episodes

Yoo In-soo

Bagboy

1 episode

손기철

Reporter

1 episode

Lee Keon-gu

Gangster

1 episode

Choi Woo-jin

Doctor

1 episode

Lee Su-mi

Insung Supermarket Owner

1 episode

Kim Eun-kyung

Neighbor

1 episode

Yoon Sang-won

Yang Chun-bae

1 episode

Kim Seo-kyung

Kim Seok-hyeon

1 episode

Lee Ki-seop

Mr. Jang

1 episode

Kim Chan-hyung

Correctional Officer Han

1 episode

Song Young-chang

Oh Bong-chan

1 episode

Kim Jong-hyun

Real Estate Agent

1 episode

Seo Jae-hee

Jin Gyeong-suk

1 episode

Kim Young-sung

Ji Ho-cheol

1 episode

Kim Ji-Yu

Young Ji Han-na

1 episode

Jung Jae-won

Lee Gwang-se

1 episode

Choi Woo-jung

Nurse (eps 5)

1 episode