Ailiseu (2009–2013)

Yeong-cheol Kim

Baek San 36 episodes, 2009-2013

Yun Ju-sang

Oh Hyeon-Kyu / ... 31 episodes, 2009-2013

Seung-woo Kim

Park Cheol-yeong / ... 26 episodes, 2009-2013

Lee Jeong-kil

Kim Seon-hwa / ... 21 episodes, 2009-2013

Lee Byung-hun

Kim Hyun-Jun / ... 21 episodes, 2009

Kim Tae-hee

Choi Seung-Hee / ... 21 episodes, 2009

Jun-ho Jeong

Jin Sa-Woo / ... 21 episodes, 2009

Jang Hyuk

Jung Yoo-Gun 20 episodes, 2013

Beom-su Lee

Yoo Joong-Won 20 episodes, 2013

Lee Da-hae

Ji Soo-Yeon 20 episodes, 2013

Soo-hyang Im

Kim Yeon-hwa 20 episodes, 2013

Doo-Joon Yoon

Park Sang-Hyeon / ... 19 episodes, 2009

Yeon-su Oh

Deputy Director Choi Min 18 episodes, 2013

David Lee McInnis

Ray / ... 17 episodes, 2009-2013

Jyu-ni Hyun

Kang Byung-Jin 17 episodes, 2013

Hyun Jung Cha

Yoon Shi-Hyuk 16 episodes, 2013

Han-Yong Jeong

Jung Hyung-Joon / ... 16 episodes, 2009

Ji-Yeon Myeong

Vick 14 episodes, 2009

Yong-gi Park

Park Tae-Hee 12 episodes, 2013

Hyeong-kon Kim

Lee Cheol-Min 8 episodes, 2013

Joo-Hee Yoon

President Ha Seung-Jin 7 episodes, 2013

Bo-Hee Lee

Chief of Staff / ... 6 episodes, 2013

Saejoon

Yoo Jung-hoon / ... 5 episodes, 2009-2013

Ho-min Yeo

IRIS soldier 3 episodes, 2009

Gun-Tae Park

Young Ji Soo-Yeon 3 episodes, 2013

Dong-il Sung

Park Joon-Han 3 episodes, 2013

Na Yeon

Kang Cheol-Hwan 2 episodes, 2009

Suk Goo Lee

John 2 episodes, 2013

Park Sang-wook

Chinese Firearms Dealer 2 episodes, 2013

Jong-ryol Choi

Captain Jung 1 episode, 2009

Masayuki Itô

Phillip 1 episode, 2013