Interior designer Wen Shuran takes on the Old Street restoration project, only to unexpectedly reunite with Jiang Chi, an ancient architecture restorationist who left without a word eight years ago. The restoration work in the bluestone alley forces the two to work together once again. Past misunderstandings and realistic schedule pressures intertwine, while old blueprints and notched folding rulers hide sealed past events. As the project progresses, the truth behind the disappearance without a word from back then gradually unfolds. Two people trapped by regret resolve their long-standing emotional knots amidst the evening breeze and old wooden streets, fix their relationship, and welcome their happy ending.