Carpenter Lu Yuan remains committed to traditional solid-wood mortise-and-tenon craftsmanship and refuses to use inferior boards. Businessman Zhou Kai deceives Sun Fuhai with cheap, toxic furniture, earning his trust and putting his pregnant daughter-in-law in danger of formaldehyde poisoning. Filled with remorse, Sun Fuhai turns to Lu Yuan for help. Lu Yuan joins forces with veteran craftsmen to produce solid-wood furniture without glue in just fifteen days. Inspired by the craftsmen's spirit, young Xu Zhizhou becomes Lu Yuan's apprentice, rejects the temptation of mass production driven by capital, and carries on the philosophy of 'removing the bark while preserving the core,' embodying the unwavering integrity of true craftsmen.