Actually when I started this drama I have different concept in my mind but as episodes goes by I emotionally got involved in the drama , I couldn't wait to finish the drama and eagerly waited for the end !!

Story synopsis
Sung Jun ang Jung sun(wife) are a happy couple for 10 years. Both wife and husband have their difficulties since child hood.
Husband comes from a family where his mother is a mistress and he recieves no love from father where as wife comes from a family her mother abandons her and grew without mother's love.
They fall in love and dreamed to be a perfect family which they couldn't have !!
Husband is aware of wife's mother and family background but wife is not aware of husband's family issue.
Jung sun gets aborted and goes into a trauma in the same time he have an affair with a girl called yue-ri which has identical past of Sung Jun.
Sung Jun father dies when Jung sun is in depression and he could not share his sadness with her, I was very frustrated throught the episodes why does husband doesn't share his sadness irrespective of having 10 yrs of relationship. While Jung sun is such a brave lady even after knowing her husband's accidental affair, she tries to understand him and forgive him and gives a chance to him.
There is no annoying second male lead so the drama carried the cheating husband and brave and confident wife's emotion through out the drama
In the end I understands why husband can't share his sadness about his family, because wife was already disappointed in her mother as she abandoned her bcoz of other man, where as if she finds out hero came from the opposite scenario his mother is a mistress who destroyed a happy family. So he couldn't convey his situation to her.

But being with her for 10 yrs he could have understood her and be honest with her.Even I got more annoyed when he tried to hide the things of women who is he having affair with irrespective of how many times heroine tried to find out and give him a chance

Clearly he is not in love with yue-ri, I hated him not being clear of his thoughts, may be in real life people are like him.
I was happy they are not together in the end because sung Jun doesn't deserve Jung sun