The summer when he was 18 years old was the most dazzling chapter in Xu Jiahao's memory. From the initial acquaintance in kindergarten, the two have a little secret in common; and then in elementary school, the relationship between the two warms up in sweetness. From the initial boy chasing the girl, to the tacit understanding and mutual favor later, the two people with reversed personalities will take the opportunity of a midsummer to pierce the window paper.