She's on Duty

Undercover cop Jae In has just been assigned to the most dangerous assignment of her career — she's going back to high school!

Mob boss Bae Du Sang is about to have a nervous breakdown trying to find his former partner Cha Young Jae, who has apparently changed his ways and is a possible target for the prosecutors in a case against Bae. Word on the street is that Cha is hiding out, and the only way to find him is through his only sibling — his teen daughter Seung Hee.

Jae In is sent in as an undercover agent to befriend Seung Hee and locate the whereabouts of Cha before Bae and his cronies find him. When her assignment takes unusually long — since Seung Hee is never contacted by her father — Jae In tries to adapt to high school life once again.

But high school is no walk in the park, as Jae In quickly finds out. Her days are filled with zit-filled girls who gossip every chance they get, piles of homework, and a lot of catfights.