ML had a bet with MC to make him fall in love but he had another bet behind MC's back with others to make MC fall for him.
MC has an unrequited love for his friend. ML is the brother of the friend's wife
raws
https://toonkor217.com/%EC%9D%B4-%EC%82%AC%EB%9E%91%EC%9D%98-%EC%84%B1%EA%B3%B5-%ED%99%95%EB%A5%A0%EC%9D%80
What’s the Probability of A Successful Love?