Mein heimlicher Geliebter ist mein Bruder

Betrayed by her fiancé and stepsister, Claire, heiress to the Grayson family, needs a baby to secure her inheritance. She asks her best friend to find a reliable sperm donor. However, her adoptive brother Ethan, who has secretly loved her for years, finds out. He returns from abroad, secretly replaces the man Olivia arranged, and becomes Claire's mysterious date...