One day by chance, Shan Yi, a freshman in high school, came home from school and found that his room had turned pink, which made him collapse. It turns out that the parents reached an agreement with the parents of their childhood sweetheart Yu Xiaoye and secretly exchanged children! In this way, the boy and the girl were forced to start a strange "exchange life". Not only did they discover each other's secrets in their respective rooms, but they also realized the magical differences between the two creatures - she loves snacks, likes pink, and will stay up late to make statistics for idols; he doesn't like sweets, likes basketball, and stays up late to clear the game. Just like they don't understand why there are so many weird differences between boys and girls, they also don't know that the differences between them are not only about gender, but also about the years they grew up together - in kindergarten, she cried because she didn't have enough candy, and he always left his share to her; in the third grade of elementary school, he broke his leg on a rainy day, and she stayed with him in the hospital for half a month; in the first grade of junior high school, she would support him on rainy days. An umbrella, and he was used to helping her unscrew the bottle cap when she drank Coke; now, when they looked at each other, they saw themselves in each other's eyes, and they were ignorant and didn't know what it meant. But from then on, sunny or rainy, morning and dusk, everything became different... In the middle of their youth, this little "exchange trip" made them gradually discover that in the ignored details of growing up together, there was another "each other" they didn't understand.
