Woo-Yeon, who is perfect in everyone's eyes, and Jae-Hee, who have been living their lives without any major ups and downs, loving each other. One day, as a bride-to-be preparing for her wedding with Woo-Yeon, Jae-Hee has a dream about the day she first met Woo-Yeon. Since then, Woo-Yeon seems different and memories she had forgotten start to pop...