Chan Joo and Jin Se marry in hopes of starting fresh—she wants to forget the past, and he wants to build a new future. At first, they settle into a quiet, ordinary life. But over time, boredom sets in, and both secretly begin longing for their past loves.

As they reconnect with old flames, their once-stable marriage begins to fall apart. In the process, they rediscover parts of themselves they had forgotten. But after the emotional turmoil, they come to understand that real happiness lies not in the excitement of the past, but in the quiet, steady rhythm of everyday married life—an honest, if bittersweet, truth about love and commitment.