With the old street about to undergo renovation, Wen Zhen is responsible for measuring, repairing, and documenting the storefronts. But Lin Ji insists on preserving the missing corner of the handwritten sign left by his father, which longtime customers recognize at a glance. He worries that filling it in will erase the shop's connection to its past. Faced with aging electrical wiring, measurement discrepancies, obstructed visibility caused by reflections, and budget constraints, Wen Zhen and Master He inspect the shops one by one, distinguishing essential safety upgrades from lettering that should be preserved. Every repair is documented, and no gaps are filled based on guesswork. Can the missing corner be preserved exactly as it is? And after renovation, will the new storefront signs still help newcomers find the old street's little shops?