I remember seeing some episodes a while back but all I can remember is the FL seems to be involved in a love triangle between a rich guy and a childhood friend(maybe?). She didn't like the rich guy much but when her brother got sick the rich guy offered to help her if she agree to marry him so she did. I don't remember what happened next but after a while the FL seem to get depression or a mental breakdown, so the rich guy divorce her thinking she'll be happier with the other guy. In the end, when the FL got better, she decided to chase after the rich guy after realizing everything that he did for her. She found him sitting by himself on a beach somewhere and they got back together. Does anyone recognize this description? Thank!

Is it this one https://mydramalist.com/714811-101-marriages 

I only watched the first few episodes but the synopsis seems like it

Thank but I don't think those are it.  The synopsis seem to be really closed but I don't think the one I watched was released this year.