Blue City is a clean and pure city with a history of thousands of years. There are four major families there, the Lin family, the Mo family, the Xu family, and the Yin family, and a group of innocent and lovely children, Zhi Xi, Zi Yan, Xuan Chen, Lan Xiang, Fang Da, Yan Ge, Shen Nian, Jin Qi, Ruoyou, Yu An... They all make people feel sad. At the end of the story, when love has turned into sorrow, what will be the final outcome? The world is small, and they met each other after going round and round and continued their shallow relationship together at the beginning...