When she was seven years old, Yu Sheng met Wang Zhaoyan for the first time. She introduced herself: "Hello, my name is Yu Sheng." When she was twelve years old, Yu Sheng and Wang Zhaoyan were at the same table. She put a ballpoint pen between the two of them, and then proudly announced: "No crossing the boundary." At the age of fifteen, Yu Sheng took the mineral water Wang Zhaoyan handed her on the sports field, smiling like a flower: "Thank you! "At the age of eighteen, on the eve of the college entrance examination, on the dusty construction site, Yu Sheng asked Wang Zhaoyan loudly: "Are you just giving up like this?" Twenty-two years old... Twenty-six years old... Now, in a crowded venue, Yu Sheng is sitting in the middle of the front row under the stage, looking at the people on the stage with clear eyes, and a quiet smile that has passed the time on his face. Under the flashlight, Wang Zhaoyan said to her the most beautiful words in the world: "Yu Sheng, I am grateful for your company on my muddy road. I will protect you from dust on your future journey."