A Killer Paradox

Choi Woo-shik

Lee Tang

Son Suk-ku

Jang Nan-gam

이희준

Song Chon

한상경

Hard-hitting

Lee Joo-young

Kyeong-ah's mother

남진복

?

Hyun Bong-shik

Park Bok-joon

김요한

Nobin

권다함

Ahn Yong-jae

오민애

Lee Tang's mother

김민주

Lee Young

허선행

Lee Tang's father

Park Ji-han

Jung Gang-hyo

Jung Yi-seo

Sun Yeo-ok

Yang Mal-Bok

Shin Jung-hee

정회린

Eun-seon

최선우

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

이상원

Detective Kim

Jang Ji-an

Jang Nan-gam (young)

Kang Jee-seok

Jang Nan-gam (teen)

Lee Ju-won

Jang Gap-soo

조현우

Yeo Boo-il

문영동

Lee Gwang-hoon

Choi Mi-geum

Club senior

Kim Keum-soon

Gwang-hoon's wife

장선

Jae-soon

Lee So-won

Kang Yeon-seo

Lee Jung-ok

Kang Sang-mook

주인영

Kang Jae-joon's mother

고도하

Delivery man

Lim Se-joo

Choi Gyeong-ah

Song Hyeong-su

Noh Eui-cheol

Jae-won Roh

Ha Sang-min

Han Yoon-ji

Hyeon-ji

Gun Woo

Choi Gyeong-ah's ex-boyfriend

장준휘

Team leader

Han Ji-an

Hyeong Ji-soo

승의열

Hyeong Jung-guk

Jang Ui-don

Congressman