After I Forgot Him, I Married His Rival

My fiancé found eight men to take turns pretending to be him. He thought my memory reset every few months. He thought I didn't know. He was wrong. For three years, I played the perfect amnesiac while he cheated, lied, and planned his wedding to another woman. So I made my own plan. His rival wanted me. I said yes. Now the game is over—and he's the one who loses everything.