After losing her older sister and brother-in-law in a hit-and-run accident, Jung Yuna has been raising her niece, Jian, while living a strong and independent life as a working aunt. One day, Kang Iden takes over as the new CEO of the asset management company where Yuna works. From their terrible first meeting to the endless embarrassing mistakes she keeps making, Yuna finds herself caught in a series of humiliating moments ever since she met Iden. Meanwhile, Iden, who needs a family for his business in the Middle East, proposes that Yuna and Jian become his fake family. To pull off the perfect act, the three begin living together. But as time passes, Yuna starts seeing a different side of Iden — one that wasn't as insufferable as their first encounter. And before they know it, they find themselves falling for each other... They only planned to be a pretend family, so how did love get involved?! Will Iden and Yuna truly become a real family in the end?