The Wolf in the Shadow, the Card in the Game

[Suspense reasoning + group portrait + IQ online + no system] In the 23rd year of the Republic of China, former detective Shen Yanzhi received a mysterious invitation, "See you at Langshan on a full moon night for an unfinished game." The handwriting was stained with strange water marks, which was strikingly similar to the handwriting of the deceased in the "Werewolf Case" three years ago. The crescent-shaped scar on her left hand suddenly became hot, implicating the mystery of her sister Shen Qingwu's disappearance five years ago - the half-brass wolf card she held tightly at the end coincided with the water mark gap on the invitation. Seven people were invited to climb Langshan Mountain. On the isolated island shrouded in thick fog, the gloomy inn hid mysteries: bloody carvings of the word "wolf", seven strange red lanterns, old photos with the same appearance as the guests... A werewolf killing that merged with reality quietly began. The "sacrifice" on a full moon night recreates a century-old death method, the prophet discovers the deepest secrets, and the witch's poison gives birth to wandering spirits. With the frequent murders in the inn, the smuggling network "Wolf League" has surfaced, and everyone wears an identity mask: the redemption of the black cheongsam proprietress, Scarface's double-sided chess game, the cheongsam woman's fake antidote conspiracy... Under the guidance of Scar Burn, Shen Yanzhi pieced together the connection between his sister's disappearance and the "werewolf case", but found that there were no civilians in this game, and even he was a pawn. When the micro ledger in the wolf card mezzanine reveals the ultimate truth, who is the last werewolf in the final showdown on a full moon night? And what secrets are hidden deep in the Langshan cave that could subvert everything?