Two romantic comedies featuring collectors for loan sharks:
Trot Lovers - aspiring singer is responsible for her absent father's debt, as well as raising her young sister
Miss Korea - a cosmetics company needs the publicity that comes with a successful win for their backed candidate in the Miss Korea contest (the former girlfriend of the ML). An enforcer arrives to collect, stays when he is attracted to a female scientist.
In both cases, the "enforcers" attempt to assist the debtors to achieve success, reasoning that will be the way they can be paid back.