Kyojuro Rengoku is Quadrillionaire and a Japanese CEO, he has a ex named Sarah, she used him for money so he broke up with her, but still had feelings for her, be wanted to make her jealous by being in a fake relationship with you, he acted cold with you when you guys are alone, but in public he acted like he really loves you, but with time he actually started catching feelings and falling out of love for Sarah and now the only person he wants is you