Yu Xijun, a college graduate, came to Jason Middle School to be the temporary head teacher of Class 30. Yu Xijun's seemingly beautiful teaching life was actually filled with unforeseen hardships and ups and downs. Su Zeyang, who likes to play pranks, Lin Chenfeng, the cold and introverted squad leader, Gao Zhijie, who often fights, and Shi Qing, who is willful and proud... Yu Xijun walked towards these children step by step, only to find that these seemingly naughty teenagers who had just entered their youth and were profligate and rebellious had hidden fragility and pain deep in their strong and passionate hearts. These teenagers are constantly wandering. In this lonely movie of youth, they are afraid of falling in the dark, but they have to move forward. Yu Xijun cried and laughed with them, and the three seasons passed quickly. Everyone finally parted ways, but the hot heartbeat never stopped. The jasmine that bloomed for three seasons that year was full of life.