It's been a while since I read the novel so someone cmiiw
- MC's undercover would be busted
- The original plan (kill ML) was proceed as usual but ML didn't get killed, just hurt a bit
- MC ran away for the 1st time, felt betrayed cuz ML wanted to kill him too
- ML threatened him so MC had to come back
- ML hired MC and the Wang bros to do some jobs. This was when Wang bros knew about MC and ML true relationship
- MC and Wang bros ran away for the 2nd time after doing their job, ML caught them
- Their first sex was more to non-con. Basically afterwards their relationship progressed from enemies to lovers
- There'll be more side characters in the future for the plot
- Just when they were lovey-dovey, ML's father caught them.
- ML said just to take him alone but MC insisted to tag along
- Both of them got caught. MC threw an axe to ML's father but he didn't die on the spot. The father would die later at the hospital.
I think that's all for the main story. It is a happy ending. ML is a freak/crazy and down so bad for MC. Maybe the quite uncomfortable part is the non-cons. There's another good plot in the side story too. I would say the story is really good, maybe the manhwa is even better.

Spoiler
Its ML's father who hired MC to kill ML. Whole novel i actually thought it was his stepmom or his older step bro. Lol! That disclose was quite fascinating. MC killed ML's father with an axe. Slassshed. ML was so proud lol!