 Riding the big success of "Coffee Prince" and "Goong", Yoon became one of the highest-paid actresses in the industry.In 2009, Yoon starred in KBS' romantic comedy "My Fair Lady", playing an arrogant, strong-headed heiress of a rich business family.Although "My Fair Lady" was a moderate success, Yoon was harshly criticized for her unnatural speech and accent as well as her regression in acting skills.