I've seen some side character storylines in dramas and also some where there might be non-romantic relationships between debt collector and female lead who has to pay it back for her family or spouse (like in Liar Game kdrama there was a strong non-romantic friendship between collector and female lead).
Did not like (Can love become Money)
There was a little in The Gentlemen of Wolgyesu Tailor Shop, where the debt collector was smitten with female lead even though he has thug like background, he still paid off the debt for her and wants to marry her.
I wouldn't mind something like that if anyone has recommendations. thanks!