Min-su

Seo Hui-kwon (10 episodes)

The Assassin / Detective Kang (10 episodes)

Jae-in

Choi Kang-hu (16 episodes)

Taekdong

(1 episode)

Self (1 episode)

Father Kim

Seong-joon

Sin Se-do

Lee Yeon-woo

Gam Poong-Ki (72 episodes)

Koo Hyun-mo (1 episode)

Won-ho

Himself (1 episode)

Lee Jin Sang (40 episodes)

Eun Kyung-Soo (40 episodes)

Self (1 episode)

Hee-Soo

Mo Hwi Cheol (1 episode)

Mo Hwi-Chul (16 episodes)

Han Jae-hee

Cha Jung-Han (16 episodes)

(5 episodes)

K

Sung-kyun (1 episode)

Wang Seong-ki

Moo-myung / Lee-bi (20 episodes)

Lee Seok

Yoon Cheo-yong (20 episodes)

Himself (9 episodes)

Jang Kyu-Jik (16 episodes)

Kim Seung-hyun (20 episodes)

Baek Dong-su

Kim Dong-soo

(1 episode)

(2 episodes)

Song Tae-ha (24 episodes)

On Dal-soo (20 episodes)

Himself (1 episode)

(16 episodes)

Go Man-soo / Karl Go (16 episodes)

Gong-chi

Jang Cheol-Su (16 episodes)

(24 episodes)

(16 episodes)

Lee Bong-sam (20 episodes)

Nam Kyung Soo (1 episode)

Nam Kyung Soo (22 episodes)

Jino

(15 episodes)

Ju-hak

(16 episodes)

Ji-Hoo

(1 episode)

The writer