It was arranged marriage but she liked him earlier. Then he kind of took her feelings and kindness for granted. He didn't hurt her but her feelings were not reciprocated until she signed divorce papers. Then he started to realize her importance in his life. Then we've his family & 3rd person melodrama.

This drama haven't been subbed yet. So, I did not understand why the fuck he had to go through official divorce procedure and leave her. If I'm not wrong, his assistant said, it's to protect her but he clearly knew she's pregnant with his child and he still divorced her. Plus, her reputation was ruined by a bitch and she didn't have a job at that time.

Then he was enlightened after his mom planned his engagement and decided to put on act with FL.