Rooftop Prince (2012)

Crown Prince Yi gak finds that he has been transported from Chosun Dynasty to modern-day Seoul. He meets Hong Se Na, who bears a striking resemblance to his dead wife, and is determined to solve 300-year-old mystery of her death with his own resemblance to the CEO grandson at the company, where Se Na works,Gak assume the identity of the young man to stay close to her. Can the crown Prince navigate a modern corporation to find his own time period?