A Killer Paradox

최우식

Lee Tang

손석구

Jang Nan-gam

이희준

Song Chon

Han Sang-kyung

Hard-hitting

Lee Joo-young

Kyeong-ah's mother

Nam Jin-bok

?

현봉식

Park Bok-joon

김요한

Nobin

Kwon Da-ham

Ahn Yong-jae

오민애

Lee Tang's mother

Kim Min-ju

Lee Young

Heo Seon-haeng

Lee Tang's father

Park Ji-han

Jung Gang-hyo

정이서

Sun Yeo-ok

양말복

Shin Jung-hee

정회린

Eun-seon

Choi Sun-woo

Gyeong-hwan

Baek Yu-sung

Lee Jin-seong

Seo Jae-kwon

Kang Jae-joon

Park Kyung-geun

Chief of crime department

오우리

Mi-young

이지훈

Moon Myeong-jun

오혜원

Lee Yoo-jung

Lee Sang-won

Detective Kim

Jang Ji-an

Jang Nan-gam (young)

Kang Jee-seok

Jang Nan-gam (teen)

Lee Ju-won

Jang Gap-soo

Jo Hyun-wu

Yeo Boo-il

문영동

Lee Gwang-hoon

Choi Mi-geum

Club senior

김금순

Gwang-hoon's wife

Jang Sun

Jae-soon

Lee So-won

Kang Yeon-seo

이중옥

Kang Sang-mook

Joo In-young

Kang Jae-joon's mother

Go Do-ha

Delivery man

Lim Se-joo

Choi Gyeong-ah

Song Hyeong-su

Noh Eui-cheol

노재원

Ha Sang-min

Han Yoon-ji

Hyeon-ji

Gun Woo

Choi Gyeong-ah's ex-boyfriend

Jang Jun-whee

Team leader

Han Ji-an

Hyeong Ji-soo

Seung Eui-yeol

Hyeong Jung-guk

장의돈

Congressman