After secretly marrying Min U Bin, Kang Ji Won hides her identity as his wife and the world-famous designer "Summer" to join the company as an ordinary employee. Lee Yun Ju targets her and tries to claim the title of being the CEO's wife. Even U Bin's mother turns against Ji Won due to rumors. Meanwhile, U Bin's younger brother unknowingly falls for Ji Won. At a major fashion launch, Yun Ju steals Ji Won's designs. How will Ji Won handle all these challenges?