Lin Xia, a graduate student in the Department of Archeology, accidentally touched the fluorescent moss of an ancient tree in Cangwu Mountain and fell into the Southern Chu Kingdom that was not recorded in history books. Facing a plague-ravaged village, she used modern medical knowledge to save a dying child, but was besieged as a "plague ghost". At the critical moment, the eccentric doctor Gu Huaizhou squeezed into the crowd with a basket of medicine: "The 'virus mutation' this girl mentioned coincides with the scraps left by my master."
He smiled naively and used a magnetic compass to reduce the child's fever, but spent the middle of the night in a daze reading medical books in simplified Chinese. When the two of them improved the waterwheel blueprints and taught the villagers to purify penicillin, Lin Xia discovered that the fluorescent lines on his wrists had the same origin as the time-traveling moss. Three hundred years ago, a time-traveler wrapped a baby in a protective suit and threw it into a rift in time and space. That child became Gu Huaizhou's master.
When the star moss in the seventh ring of the ancient tree's growth rings was in full bloom, Lin Xia held onto the luminous mycelium in the petri dish: "Didn't your master say that? The real cracks in time and space are the hearts of those who plant the future into history." The mountain wind passed by Gu Huaizhou's off-key "Blue and White Porcelain", and the electronic watch froze at the moment of the full moon. The fragrance of clover in the medicine basket wrapped around the yellowed cuffs of the protective suit.
