What makes this drama stands out, for me is that there is no villain or bad guy. There is no one enemy of the lead characters, or the character that causes problem from beginning to end, or character who hurts others out spite or reasons we cannot relate to, or love rival, none of that. The conflict is within the characters' way of coping or reacting to past events that are explained through flashbacks. Everyone is going through something, maybe pain, and that makes them act certain way, and in the end most of them are resolved.