Unfortunate. You can see that they still deeply love each other. Cheating kills a relationship, because someone else loved her body. It would be hard to overcome that. The child is not at fault, but is the main reason for the destruction of this relationship. U hope they may overcome this, but sadly, it maybe used as a reason for these 2 to move on. She is the villain. I hope the husband divorces her and leaves to have a family of his own. Once a cheater, always a cheater. If she cheated once, she would do it again. Now she will have another excuse to cheat since she had a child with her lover and can choose to be with him to give a complete family. Short-term pain is better than long-term trauma. The husband should cut her out completely and sue her for infidelity and deception in marriage. But this is a Japanese drama, nothing will happen and they will reconcile.