Yan Ruruo's childhood sweetheart Xu Xingyuan suddenly disappeared from the whole family one night. Ruruo didn't believe the rumors outside that he was dead, so she continued to live with her original heart, leaving a place for him in her heart and waiting for his return. It wasn't until she went to high school that she met the second Xu Xingwan again. He had the same name and the same appearance. The only difference was... His memory and his life experience. So, who is he? Ruoruo started a series of stories with him with doubts...