Claire and Julian were college sweethearts who went from campus to marriage and were once the envy of everyone. However, after marriage, Julian focused on chemical research, becoming cold and distant, coming home less and less, and conflicts between the two gradually arose. A week ago, Claire found a hair tie with a little bear charm in Julian's lab coat pocket, which was not hers, and the two had a fierce quarrel, falling into a cold war. Claire drove to the city where Julian was on a business trip to find him, but met Lily, a female student wearing the same hair tie. Lily mistakenly thought Claire was harassing Julian and splashed paint on her car. When Julian arrived, although he reprimanded Lily, he chose to protect her, making Claire completely disappointed. At this time, Leo, a college classmate of the two, appeared. He had failed to confess to Claire before and still guarded her gently. After the cold war escalated, Julian proposed a divorce. The two decided to divide their property and go through the divorce procedures after negotiation. Claire gradually let go of the past and started a new life. Shortly after the divorce, Julian had a car accident and lost his memory, his memory reverting to when he was nineteen—the year he loved Claire the most. After waking up, Julian only remembered Claire and eagerly searched for her. Claire softened her heart and agreed to help him recover, but also made up her mind that once Julian's memory came back, they would end completely.