Soo-ah is about to marry a sweet man named Hamin. In front of her is Lee Gyeom, whom she has been crushing on for 19 years. Six years ago, Lee Gyeom left for abroad without saying a word, and for 19 years he refused to confess, He proposes to Soo-ah, who is three months away from getting married... “If you marry him, you will die.” Surprised by the situation, Soo-ah keeps him at arm's length, but he begins to intrude into her life. “Why are you doing this now? Once, I loved him so much, but he hated me so much. Now, the man who promises to marry me and loves me only for me, Hamin. And the woman who is loved by both of them, Sua. The strange fate of three men and three women over 49 regressions.