@Just Love To Read He will always love her, but he knows that she will never love him back because she is already in love with Dohoon. He came because he wants to express his sincerity love and respect wishing her to have a happy life even if that person is not him. I Hope It's clear now.
@Just Love To Read They didn't explain very well what the situation was. I tried to find the chapsters, the only thing I could understand was that he was insecure about his family background, so they decided to separate.
@Just Love To Read Yes, very rich but a lot of people in the world think that if you don't have a proper parents or you never were loved for them you cant give the love and caring to your children. This is a mental issue that money cannot fix. So yes, he got chicken out and in the process they hurt themselves.