In the auditorium of the No. 1 Senior Middle School in Luoqing City, Principal Luo is eloquently describing the school's 50-year history of ups and downs. The students' faces are as immature as they were ten years ago...Lu Shengyan Standing with Qi Yang under the tall sycamore tree beside the playground, the sun was shining on the ground mottled, Qi Yang picked up a fallen leaf on the ground, said with a smile: Look, the fallen leaf is still as beautiful as it was then. Lu Shengyan took it Put the leaf into Qi Yang's pocket, and solemnly said: 'Use this leaf to commemorate our lost youth... The celebration has ended. Gu Baiqiu came out of the auditorium. With a glance in his eyes, he saw something familiar under the tree. He was stunned, but still walked over, patted Lu Shengyan's shoulder lightly, and asked lightly: Classmate, what's your name?...