The female lead breaks up/divorces the brother and the male lead gets his chance. She doesn't like him like that at first because he's her ex's brother, but then falls for him. The brother is against it and tries to get inbetween them. 

You are asking very difficult recommendation but I have found :-

https://mydramalist.com/14600-les-interprtes 

check this out!!!!!!!!!!!

not exactly what you are asking but similar to it~!!!!!!!

hope you like it!!!!!!!!!!!