Because your ex had an affair with your sister, you decided to take revenge on him by going on a date with his father is Young-Jun to approach revenge on your ex.

Even though Young-Jun and you were in a relationship, he treated you coldly.

Until one day when he knew you loved him just to get revenge on his son , he immediately threw you into his bed and pressed you down, speaking in a cold voice

"So you love me just to take revenge on my son? Hm..Then i think tonight I'll teach you again."