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 as 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 her who is his true love. The one and only thing this man wishes for is to find his onetrue love and spend the remaining 90 days 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 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?