The story of a 34-year-old woman who's saddled with family debt and only has a high school qualifications, but dreams of becoming a fashion designer. Her youthful appearance is her only advantage; she is mistaken for a 25-year-old university graduate and subsequently lands her dream job when she's hired by a fashion design company.

A fate that surpasses taboo, a love that surpasses morality...

Hyun Ji-seok (Kang Ji Hwan) is at the peak of his life at thirty-one year old he is fated to leave this earth in three short months. he is married to Park Jung-ran (Jung Hye Young), but it's not shes not his true love. The one and only thing this man wishes for is to find his one true love and spend the remaining 90 day's that he has left with her.

Hyun Ji-seok was fated to meet Mi-yeon (Kim Ha Neul) but their hearts were destined to be broken in the end. Through an unexpected turn of events, Mi-yeon turns out to be his his first cousin. They are now desperately pleading for 90 days in which to love each other for the last time on earth.

Will their love be able to overcome the harsh realities of society?