Hello, I started to read a manwha a long time ago, where the mc start without money, and is a scumbag with his gf, that keeps being nice to him, then he tries to change and pay back to her the money that he got, but something goes wrong,he lost the money, one woman appears and make a contract with him, he goes to an encounter in a school, where there's various persons, some monster attacks the persons, they have to survive, find some coins to gain points and are teleported to one place where they train, something like that, I can't recall much more. Someone remembers of a manwha like that? Thanks for the help

Should be The Second Coming of Gluttony.

~4400 manga completed
~1700 ongoing...

Thank you, that's the one.