Xiao Xinrui, an ancient bamboo tea drain designer, only insists on two things in his life: the density of bamboo holes must be accurate to 0.05 Mm, and he voluntarily disappeared from Lin Zhiluo's world three years ago. On the day of their reunion, the sweet-scented osmanthus oolong she brewed stayed in the tea drainer he made for seven seconds. The tea soup was so astringent that it made people's eyes sore. The silver bamboo bracelet on her wrist was the "Acacia Buckle" he had woven back then, and it was now covered with old marks. When commercial orders are placed, air humidity, cooking shrinkage, hole diameter tolerances - every process difficulty is like a mismatch between them. Until he discovered that she had spent three years recording the changes in the flow rate of each tea drain, as if she was waiting for someone to adjust their pace and come back. It turns out that the tea soup is delicious but the density is just right. People's hearts are in harmony but the steps are in the same frequency. Only after the bamboo silk has absorbed the tea color, can we understand what is just right.