This is a very simple story. Briefly, when he was an immature adult, he met Wang Chuyan, another immature adult. The two children were together, but naturally, the immature two separated.
Five years later, when both Wang Chuyan and Jian Shu had matured, they met again, arousing the memories of each other not long ago. The two...
(Actually, I'm just a bad copywriter...)