A Killer Paradox

Choi Woo-shik

Lee Tang

Son Suk-ku

Jang Nan-gam

Lee Hee-jun

Song Chon

Kwon Da-ham

Ahn Yong-jae

Oh Min-ae

Lee Tang's Mother

Hyun Bong-sik

Park Choong-jin

Kim Yo-han

Roh Bin

Kim Min-ju

Lee Young

Heo Seon-haeng

Lee Tang's Father

Park Ji-han

Jung Gang-hyo

Jung Yi-seo

Sun Yeo-ok

Yang Mal-bok

Shin Jung-hee

Jung Hoe-ryn

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

Oh Woo-ri

Mi-young

Lee Ji-hoon

Moon Myeong-jun

Nam Jin-bok

Ji Gyeong-bae

Oh Hye-won

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

Lee Ji-hae

Detective Park's Wife

Cho Hyen-woo

Yeo Boo-il

Moon Young-dong

Lee Gwang-hoon

최미금

Club Senior

Kim Keum-soon

Gwang-hoon's Wife

Jang Sun

Jae-soon

Lee So-won

Kang Yeon-seo

Lee Joong-ok

Kang Sang-mook

Joo In-young

Kang Jae-joon's Mother

Ko Do-ha

Delivery Man

Im Se-joo

Choi Gyeong-ah

Song Hyeong-su

Noh Eui-cheol

Roh Jae-won

Ha Sang-min

Han Yoon-ji

Hyeon-ji

Lee Joo-young

Choi Gyeong-ah's Mother

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

Jang Ui-don

Congressman

Jo Yi-peul

University Student