Begin Again with the rejected heiress

Emily, the wealthy heiress of the William family, comes home from her studies abroad to discover her grandfather has arranged a marriage for her. Refusing to accept it, she learns the family company is in deep trouble and secretly hides her identity to infiltrate the firm and track down a traitor. Her coworkers wrongly believe Nora, a newcomer hired the same day as Emily and once her high school classmate, is the real William heiress, and they rush to flatter her. Meanwhile Nora keeps suppressing Emily at every turn, leaving her to navigate the office under a false identity.