CHUN Jane, a cop who’s indeed desperate to capture criminals has always been a failure because of this another detective named Joh who always steals her opportunity and ruins her plan to her success. Unfortunately, through detective Joh’s help, the mission was actually successful because Jane almost ruined the operation. Now she has another mission that was perfectly given to her.
CHA Young-jae, age 45 − the number 2 man of the Whacker, the biggest gang in Seoul had accepted a deal with the police to testify against BAE –CHA’s boss, in exchange for immunity. But the deal went bad while he was being transported. CHA Seung-hee, age 45 – a junior at Young-Mun High School and the only child of CHA. Mission: Get CHA Young-jae back to their custody. Plan: Put Seung-hee under around the clock surveillance. The moment CHA contacts her, they’ll get him.
Jane now enters to the world of a High School girl again to be a student as her undercover, which is, she hates school so much. Refused and reluctant with her assignment to be a student undercover, her uncle Captain Chun still managed to force her into it. Jane now becomes a regular student at Young-Mun High School and starts to work with her assignment which is to get closer with CHA Seung-hee, which will be a hard mission for her. She’s on Duty is really a nice movie. It’s a comedy – action – drama story. I’m sure you’ll love it too! 
