The young man was surprised when his lover's mother was his ex-lover

This man is my ex-boyfriend. Of course, neither my husband nor my sister knew about it. I was young and both my parents passed away when I was young. I was living my life, but this man who knew me in the past came to me for some reason. Rub. I should have refused, but my husband and sister somehow found out about my past. I think I don't want to. I just listened to what he said. It's my fault.