During the Tianbao period, demons grew in Chang'an City, the powerful took power, and undercurrents surged in the prosperous age. Chen Shi, a corpse stitcher on Jisi Street in Chang'an West City, seems to be a money-grubbing businessman, but in fact he possesses the ancestral stunt "Thirteen Needles at the Gate of Ghosts" and the mysterious "Illustrated Book of Underworld". On the eve of the Lantern Festival, a female corpse that was transformed into a "Peony Flower Evil" was sent to the shop, triggering a shocking conspiracy using human skin as paper and white bones as a frame, with the intention of polluting the dragon's veins and subverting the national destiny. The mastermind behind the scenes is directed at the top of the court and the frontier warriors. In order to find out the truth, Chen Shi had to form an alliance with Qingtan, a cold-faced female assassin whose identity is a mystery, and Ba Ye, a ghost-faced parrot who has a mean-mouthed and psychic voice. They broke into the ghost market of Chang'an, where they never saw the light of day, and faced the demon eunuchs who made lamps out of living people. Under the sewing needle, what is sewn is not only the broken body, but also the broken truth and the country that is about to collapse. From the sinister shop to the deep courtyard of the palace, from the ghost market to the frontier military camp, Chen Shi uses a needle as a knife and a thread as a guide to find his own way to "repair the sky" amidst demons, intrigues and wars in troubled times.