
is this has a novel? Can you give me a spoiler about the storyline?

They got the novel, you can check spoiler here: https://www.novelupdatesforum.com/threads/the-age-of-arrogance-%EC%98%A4%EB%A7%8C%EC%9D%98-%EC%8B%9C%EB%8C%80.156918/

For some reason I don't like FL's personality. why does she have to talk about his household problems with his male friends? Moreover, his guy friend has feelings for her. fl is also a bit selfish in my opinion, she also likes to make his own assumptions without listening directly to ML's opinion. I knows she's worried but she's too insecure.

Ah, the 2ndml kind of trope, yeah, it's kinda off but it's a good thing. Because of Ansel they discovered that MC is not a fallen noble, ML is readily investigated the said problem and the couple knows and she becomes complete that's what matters. It's a little bit off but it doesn't make the story sour to the point you want him dead for sure.
Who the ml?