DUBAI: South Korean director Jason Kim’s latest project, “Officer Black Belt,” is marketed as an action-comedy. And for the first 40 minutes or so, you can see why: it sets out as a so-so take on the “odd couple/buddy cop” trope. But then comes a shift.

The story: likeable-but-aimless Lee Jung-do (Kim Woo-bin) spends most of his time hanging with his gamer friends and working as a delivery driver for his dad’s restaurant. One night, he happens across a probation officer who’s being badly beaten by one of the violent ex-cons whose ankle bracelets he monitors. Jung-do, it turns out, is a master martial artist.

He rushes to help the probation officer, likely saving his life. Probation department manager Kim Sun-min (Kim Sung-kyun) offers Jung-do a temporary job while the officer he saved recovers. He accepts, and the two quickly become friends — despite a considerable age gap and what at first seems like a major difference in lifestyle choices.

There are some vaguely humorous scenes as the two get to know one another and as Jung-do gets to grips with his new role — and with several parolees. The general goofiness of these early scenes takes a turn when a notorious child abuser is released from prison and becomes the responsibility of the already over-worked probation department. The fight scenes are no longer comic-book-style entertainment, but grimly lethal, and the storyline gets especially dark when a young girl is abducted with the intent of forcing her to .