I Married My Ex's Brother

"Seven years ago, Luna Sawyer was pregnant when she discovered that her boyfriend, Samuel Payne—who was battling cancer—was secretly the heir to Payne Corp in Reydon. Samuel was offered a deal: if he broke up with Luna, they would pay for his treatment. But deeply in love with her, he rejected the offer, unaware that Luna had overheard the conversation. Determined not to hold Samuel back, Luna silently chose to leave—only to be presumed dead in a car accident. "

"Sophie met Justin seven years ago, but she doesn't remember who he is. As fate would have it, they reunite seven years later after a one night stand. She mistakens him for a callboy and asks him to fake marry her, but little does she know... he's a billionaire!"