Liang Qingmu, who lost his memory due to accidentally falling into the water, overcame his aphasia and walked out of the shadows with the company of his brother Liang Qingqiao in a reorganized family for five years. During these five years, Qingmu developed feelings for Qingqiao other than his brother. Why did he, who had always liked Qingmu, always avoid her thoughts even though he knew it? In order to find his parents who disappeared five years ago, Aoki mustered up the courage to return to his previous school to find the lost memories and the reason why he fell into the water. On campus, facing Qi Yuan, a librarian who is not doing his job properly and is untidy and slovenly all day long, he feels strangely familiar. Ruan Qingkong, who returned from overseas, has always been secretly in love with Qi Yuan, but has been aggressive towards Qingmu. Aoki was very puzzled. Why did Qi Yuan, a talented student in medical school, become a librarian? This made Aoki very curious. What does his falling into the water have to do with this group of people? In order to uncover the mystery, Qingmu ignored Qingqiao's obstruction and moved closer to the truth again and again...