憎しみの先に、もう一度恋をする

A poor man finds out his wife is cheating on him. He chooses to divorce her. Later, he becomes a CEO and runs into her again. She has a child with her now. To get back at her, he keeps making things hard for her. But then he finds out the child is actually his. What is going on? After learning the truth, what will happen between the two of them?