Hyun Ji Seok is at his peak of his life and married to Park Jung Ran, but he is fated to leave this earth in just 90 days. He promises himself to spend his remaining 90 days with someone he truely loves. When Ji Seok bumps into Mi Yeon, he knows she is his true love. But what he didn't know is that she is his first cousin. Now desperately pleading themselves for 90 days in which to love each other for the last time on earth. Is it possible for them to overcome the harsh realities of society with their love?