She's on Duty

Kim Sun-a

Chun Jae-in, undercover cop

(Acting)

Gong Yoo

Kang No-young, boy at school, Jae-in's neighbour

(Acting)

Nam Sang-mi

Seung-Hee, daughter of mob boss

(Acting)

Kim Sang-ho

Detective Kang

(Acting)

Noh Joo-hyun

Detective Chun, Jae-in's uncle and boss

(Acting)

Hong Soo-ah

Jo Hye-ryung

(Acting)

Oh Gwang-rok

Bae Doo-Sang, mob boss of the Whacker gang

(Acting)

Moon Seo-yeon

So-young, girl in class who wants Jae-in's protection

(Acting)

Park Sang-myeon

Class teacher

(Acting)

Kim Kap-soo

Cha Young-Jae, second mob boss, Seung-Hee's father

(Acting)

Ha Jung-woo

Detective Cho

(Acting)

Choi Bool-am

cameo

(Acting)

Lee Beom-soo

Math Teacher (cameo)

(Acting)

Kim Ji-woo

Ja-gyeong

(Acting)

Cha Ah-reum

(Acting)