
It's not, spoiler....
Both the girl and the boy realize that they were not in love, they got married because when she was drunk she approached the boy in an attempt to go against his father, but they were not a couple, nor did they have sexual relations, they were just two good friends and they realized that
The boy even realizes that he agreed to marry her because she was pretty, but he didn't have strong feelings for her but he had a lot of fun with her so in the heat of the moment he said yes.
And she also realizes that she didn't know him.
They were never dating to begin with, she only wanted to marry him because at that time her father did not appreciate the young man, and she still had fun being with him, practically playing video games and similar, not in romantic matters.
When they realize all this they decide to divorce, he begins to properly court the other boy.
The girl is happy for both her friend and her father and she is starting a possible relationship with another person at the moment,
So no, it's not fucked up, you just don't want to read and it's respected, the category is fine, this is bl, please accept your mistake and don't confuse the new readers who are looking for bl genre, it will be the rest's decision if they want to read or not because of the plot.

Usually yeah, I also find these typa stories to be a bit icky and not my cup of tea.
However, the story, characters and general things that happen within it are so wack and even absurd as well as the fact that a manhwa with such title is somehow a slowburn romance instead of porn that I'm willing to make an exception
Also to add onto the other comment explaining [spoilers]: something that also makes it less problematic is the fact that the father had known and had feelings for the guy before the daughter had even met the guy, he was geniunly completly shocked and against their marriage so yeah
This isnt BL