She kinda did have a good reason to why she acted like that and she didn’t wanna marry him in the first place. But I don’t think she should’ve acted like that towards the son though.
Theirs actually a plot twist to this that I just found out and I dont know how to delete my previous reply
PLEASE TELL MEHhhh!!!!! Everything you know. Why did she hate him and what did her family do to her? Pretty please with a cherry on top! (ノ≧∇≦)ノ
Spoiler
The mc is actually the og soul of body but somehow got transmigrated to korea and then some soul got into her body.
to be precise our current fl soul actually lived in this fantasy world and loved our ml deeply but after the birth of her son, her soul got isekaid to Korea and some random stranger's soul got in her body hence she acted hateful towards the ml and their child but now her soul is back yet her memories are not so she does not know this all
Ohhh but if it was the other way around everyone would be like “leave him, don’t give him a second chance”