Bloodhounds - one of the MLs's mother is scammed by loan sharks so he tries to get jobs to pay off the loan.
Twenty-Five Twenty-One -ML's family goes bankrupt and his father's employees target ML for the money his father owes them.
Squid Game - +1 ML is debt-ridden and a gambler.
11 Left - short series, ML is a gambler and has gangsters after him for money he owes.
The Sound of Magic - +1 Gangsters go after the FL.