Can someone find me this BL manhwa

Iirc is that the MC got screwed over either by his friend or brother now he has tons of debt and he wants revenge so he decided to join the gangster loan sharks that came after him and his friend or brother. The ML is a tan big guy that has a dog named Maya I think? Anyways apparently the MC and ML first met at high school and the MC tutors ML because ML is always absent from school