On a rainy night, Chen Mo, a delivery boy, witnessed a Republic of China inn rising from the ground deep in a barren tomb in Suzhou. The bronze abacus hangs high, the tombstone shatters into the Big Dipper array, and a mysterious text message is received on the mobile phone: "Find the seventh guest room before midnight, otherwise you will be trapped in 1983 forever." In order to find his father who has been missing for ten years, he is forced to step into this life and death situation that spans half a century.
The inn resets every seven days, and the rules contain hidden dangers: touching the blue and white porcelain vase will detonate an array of steel needles, and anyone who says the word "hungry" will spit out moldy rice and suffocate. Chen Mo's incomplete little finger scar turned out to be the bloodline key to cracking the mechanism. As clues such as the 1951 spy list, Taiwanese spy stumps, and the cinnabar birthmark camellia emerged, he discovered that he had been chosen as the gatekeeper of the "Meridian Plate" since birth--this forbidden object that rewrote the fate of the country was dragging everyone into the vortex of time and space.
When his father's voice came from the 1983 audio tape, and when a modern 5G chip suddenly appeared in the underground palace of the inn, Chen Mo had to make a choice before the rainstorm stopped: use the physical sealing mechanism to protect the secret, or destroy the abacus to end reincarnation? In this brain-burning duel that combines folk codes, mechanical tricks and secret wars between family and country, every drop of rain hides a fatal answer.
