The Shiyuan Group issued a "death list", and Yu Ying and five other employees, HR Zhang, Ajiu, Zhenzhen, Even and Ango, need to undergo a five-month retraining plan, and those who fail to meet the criteria will be immediately revoked.The place where you receive re-training is actually an absolute primary school - Qinshiling Primary School!Six "True Little Four" Bozi, Miyu, Xiaoyu, Big Sister, Xu Yue and Elly, plus six super-sized primary school students, became the "Four Year S Class". The class teacher was served by the young and beautiful Miss Iran as the head teacher. He supported each other and carried forward a lesson in his life, and re-understood self.Because of his company, Yu Xu gradually likes to go to elementary school and has established deep friendships between his classmates.However, as the school year was approaching its end, Yu Ying was forced to withdraw from school because of her violation of school rules, and the retraining plan was also ordered to be terminated.It turns out that behind the plan is Cai Xiaoqi, the principal of Qinshi Primary School, and Ye Yihe, the owner of the Shiyuan Group...