Girl you have an issue with a genre and it's becoming such a personal issue to you that you don't realize that you are projecting on the wrong piece of art. The author can make every single character horrible and yes dumb dumb there are people who are so delusional to the point of marrying someone who isn't actually in love with them but yeah end of conversation and I hope you book therapy and get over yourself.
Ok....
I wouldn't call it bad writing, these are tools in their writing and they made that character problematic. Which then made people feel frustration towards that character, which can be considered good writing.
The gag is author villainizing a female character and y'all falling for it. Like you losers can't even distinguish bad writing to save your lives. This manhwa is basically a porno with plot