Jung Yu-na, a working aunt(?) who lives a strong life raising her niece Ji-an in place of her older sister and her husband who lost their lives in a hit-and-run accident. One day, Kang Eden, the new CEO of the asset management company where Yu-na works, takes office. From the worst first meeting to the mistakes that keep happening! Yu-na has been renewing her days of being miserable since meeting Eden… Meanwhile, Eden, who needs a family for his business in the Middle East, proposes to Yu-na and Ji-an, who have been constantly catching his eye, to become his fake family, and the three of them start living together to become the perfect family. Unlike their first meeting, which was unpleasant, Yu-na and Eden gradually fall for each other as they keep seeing different sides of each other… They just wanted to be a fake family, but somehow they even fall in love?! Will Eden and Yu-na be able to become a real family?!