Olivia, the cherished daughter of the Owen family, takes a bold step to win the heart of Simon, her childhood betrothed. Disguising her identity, she becomes Simon's mistress for three years, despite her family's objections. During this time, Olivia secretly assists Simon and his family through various financial crisis.Just as Simon's career flourishes and Olivia prepares to reveal her true identity, a misunderstanding occurs. Simon mistakes Nicole, who has just returned, for his long-last childhood sweetheart. Influenced by Nicole, Simon accuses Olivia of conspiring with his business rivals and drives her away. He even goes so far as to reject his arranged marriage with the Owen family to be with Nicole.Little does Simon know that the childhood sweetheart he's been searching for and the Owen heiress he's rejecting are both, in fact, Olivia...