Yu Qiu is a designer who adjusts the flatness of aggregate inlays for permeable trails. He works with gravel, colloids, and water permeability coefficients every day. Three years ago, she broke up with Wang He, a fan-bone silk-winding master from the same city. The two lived upstairs and downstairs, but never spoke again. Three years later, she took over the old city renovation project, facing Wang He's window. Rebuilding the trail must balance water permeability and smoothness, beauty and safety. The protrusions of each aggregate inlay are pinching the feet, like the unfinished edges and corners between them. Wang He's fan bone wrapping silk should be dense and dense, and there should be a gap for breathing between opening and closing. He understood that the same goes for emotions. But Yuqiu was still trying to compact and level all the gravel. It wasn't until a heavy rain flooded the entire road that she understood: a road that cannot retain water is dead, and a person's heart that cannot retain edges and corners is empty. A road goes from being renovated to being completed, and two hearts go from being broken to being reembedded. Dedicated to all those who don't dare to hurt their feet in relationships - those who hurt their feet are the real ones.