Switched to My Secret Billionaire

My fiancé was in bed with my stepsister. My father knew and made me marry the "dying" billionaire instead. My only solace is the mysterious waiter who saw my humiliation. He's my sanctuary, the man I'm falling for. But my "poor" lover has a deadly secret: he IS the "dying" billionaire I was forced to wed. Our marriage was a lie. Now, the most dangerous man in the city is offering me a deal: become his real wife, and we'll make them all pay. Let the revenge begin.