Responses
Well, as far as I understand Seunghyun is the cause of their divorce along with other minor misunderstandings and family issues.
The FL is suspected of cheating with Seunghyun(not that anybody believes her), Seunghyun is rejected than gets into an accident and everybody screams divorce. She forces Oppa to divorce and moves abroad.
4 years late, she returns, has an epiphany that she still loves Oppa and they get back together.
At this moment....i'm just wishing for the FL to leave the ML to see what he lost. So frustrating... ╥﹏╥