There are a group of lovely graduate students in the laboratory of Teacher Zheng of the Department of Chemistry of the University of Technology. They include the strong woman Zhang Yi, the unreliable senior brother Mo Fei, the mysophobic and obsessive-compulsive Zhang Xiaohua, the Liu Mengmeng who just wants to be a graduate, the lively and naughty Ouyang Yudie... Each of them has a distinct personality. The seniors and juniors help each other, but they also like to tease and amuse each other, and they spent the originally boring three years of scientific research together.