The doorbell rang. It seemed like a visit for moving-in greetings. Behind it was a face I hadn't seen in a long time—Yuria, my ex-girlfriend. She was now dating another man and had even gotten married. When I confronted her, I discovered she had been cheating. My anger grew day by day, and during the three days my wife was away, I devised a plan to steal Yuria away and train her completely under my control.