She's on Duty [잠복근무]

Kim Sun-a

Chun Jae-in, undercover cop

Gong Yoo

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

Nam Sang-mi

Seung-Hee, daughter of mob boss

Kim Sang-ho

Detective Kang

Noh Joo-hyun

Detective Chun, Jae-in's uncle and boss

Hong Soo-ah

Jo Hye-ryung

Moon Seo-yeon

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

Park Sang-myeon

Class teacher

Kim Kap-soo

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

Choi Bool-am

cameo

Lee Beom-soo

Math Teacher (cameo)

Kim Ji-woo

Ja-gyeong

Park Kwang-chun

Director

Lee Won-jae

Screenplay

Jeong Yong-ki

Screenplay

Lee Hyun Mi

Editor

Im Hee-chul

Producer

Sin Jae-Myeong

Fight Choreographer

Hwang Ki-suk

Camera Operator