In high school, they fell in love too young. But when their parents remarried, they were forced to become “siblings” in name. After eight years of running away, he finally returned home—ready to face the truth behind their so-called “brother-sister” bond. From quietly watching from the sidelines to cornering her against the wall, he staged a relentless plan to win her back. As an icy and brilliant detective, she now finds herself caught between solving cases, fending off his forceful advances, and dealing with his proud and jealous fiancée.