Knock Knock Loving You (2009)

Cheng Xue Ge had lived in the life of comfort and never knew the dark side of human nature until his father's company bankrupted. In order to restore the company, he must learn from his archrival, Yao Zi Wang, the ins and outs of being a shrewd, successful businessman. While working closely together, he slowly realizes her coldblooded ruthlessness was only a front to protect her battered heart. But before he could sort out his feelings about her, another man, Zhao Guan Xi, already has his eyes on her business talent and her hand in marriage.