A Hard Day

Lee Sun-kyun

(Go Gun-su)

Cho Jin-woong

(Park Chang-min)

Jeong Man-sik

(Detective Choi)

Shin Jung-keun

(Chief of Homicide)

Shin Dong-mi

(Younger Sister)

Heo Jung-eun

(Min-a)

Kim Dong-young

(Detective Doh)

Ju Seok-tae

(Detective)

Park Bo-gum

(Officer Lee Jin-ho)

Lee Ji-hoon

(Police Officer of Chemistry Storage)

Kim Bo-kyung

(Ex-wife)

Kim Kang-hyun

(Young-cheol)

Kim Hae-gon

(Vault Owner)

Gi Ju-bong

(Mr. Kim)

Bae Yoo-ram

(Police Officer)

Jang In-sub

(Police Officer)

Seo Hyun-woo

(Police Officer)

Jang Jun-nyeong

(Mr. Choi)