Stephen Chow’s 1991 comedy, “Fight Back to School,” gets a South Korean makeover and gender change in “She’s on Duty,” whereby a klutzy tomboy cop goes undercover in a high school. A splendid showcase for the chameleon talents of actress Kim Seon-ah — the tough futuristic cop in “Yesterday” and sexy schoolmistress in “Wet Dreams” — tightly written pic smoothly blends character comedy, so-so action and a smattering of sexual tease. March release handcuffed a bright 1.8 million admissions, and Asiaphiles could sign up on ancillary.
Pugnacious policewoman Jane Cheon (Kim) grudgingly poses as a mini-skirted student to befriend the teen daughter, Seung-heui (Nam Sang-mi), of a gangster-turned-state witness who’s gone AWOL. However, Jane’s volatility keeps getting in the way of business: After single-handedly beating up the school’s girl-gang, she falls for a studly male student (Gong Yu) and has difficulty getting Seung-heui to bond with her. Like the pic itself, Kim neatly balances the dumb and business sides of her character, and makes a convincing brawler when the chips are down. Lean editing keeps the large cast of likable characters constantly on the move. Coda hints at a franchise.