Both the protagonist and the female lead were involved in some business rivalry you see. And during the business meeting, the female lead correctly deduced that the protagonist was the real backer behind her business rival. So he lost his temper and raped the female lead, who was also his wife-in-name. AND benefactor. The female lead had helped him earlier when he was getting defamed by an online celebrity.
After the rape, the female lead truly fell in love with him and handed over her company.