Lu Chen and Su Wan, who had been in love for eight years, were originally scheduled to register their marriage. However, to fulfill Jiang Yu's so-called ninety-day dying wish, Su Wan chose to register her marriage with him instead, and even took away the ginkgo brooch, a keepsake from Lu Chen's mother, promising to return it after the expiration period. Heartbroken, Lu Chen decided to cut his losses. Investigation revealed that Jiang Yu's terminal illness medical record was actually forged, and behind it was Shen Yizhou plotting the heart pump project. At the Yunding wedding venue, Lu Chen publicly took back his keepsake to draw a clear line. Recognizing the scam, Su Wan collected evidence to participate in the confrontation, and multi-party games began. With the ninety-day agreement expired, can the two return to the past?