She's on Duty (2005)

Director: Park Kwang-chun

A boisterous detective goes undercover in a high school in order to befriend the teenage daughter of a notorious gangster.

Cast

Kim Seon-a

Chun Jae-in

Gong Yoo

Kang No-young

Nam Sang-mi

Seung-hee

Kim Sang-ho

Detective Kang

Noh Joo-hyun

Detective Chun

Hong Soo-ah

Jo Hye-ryung

Oh Kwang-rok

Bae Doo-sang

Moon Seo-yeon

So-young

Park Sang-myeon

Class Teacher

Kim Kap-soo

Cha Young-jae