If its not for the artwork and only 50 chapters, I won't be finishing the manhwa. MC is literally a kid. I wouldn't say he is an asshole but he doesn't know much about life outside his studies.
In short. He slept with A after being seduced by her and continue to sleep with her countless of times as sex feels good for them. Of course he is still eyeing on his original crush B. B is an innocent, naive girl and they eventually become a couple and have sex. While having this relationship. A still disturbed mc now and then.
When mc breakup with A, A seek revenge by telling B the truth. End up mc to sleep with a pub owner C a few times and the end of the story they end up together.
So yeah shitty story but amazing drawing. Whhyyyyyyy is that so...
The plot sucks and the MC is always going on about the corrupted world and innocence and is basically the poster child for hypocrisy. The only remotely good thing about this is the art.