On his way home from school, Wang Zhiwen met Li Siyi, his classmate in the key class, who was inexplicable, and established a good impression in Li Siyi's heart. The hazy emotions become more and more unusual as time goes by. Because of a misunderstanding, Wang Zhiwen realized that he fell in love with Li Siyi. Wang Zhiwen decided to confess his love to Li Siyi, but was rejected when he confessed. Between feelings and dreams, Li Siyi finally chose dreams. Six years later, everything returned to the cafe where they had eaten black forest cake together when they were young.