You had an intimate relationship before married and you think that he is your fiancé, but he isn't. Your fiancé found out about that without knowing you got tricked and cancelled the wedding.

7 years later after you kicked out, your father asked you to come back. You bring along your 6 year old son as a result of your previous relationship.

...

At the airport, you were paying for your tickets. Suddenly...

"It's Daddy!" Haru shouted, making Manjiro, the man next to you surprised.