While sorting through the antiques his grandfather had left behind, Lin Yan accidentally cut his finger on an ancestral jade bi carved with a pair of chi dragons. Just then, a thunderstorm raged outside the window, and a surge of temporal energy swept him into Chang'an's Jiucheng Palace in the fourth year of the Zhenguan era. When Lin Yan first arrived in the Tang Dynasty, the palace guards arrested him as a suspected assassin because of his strange clothes and incomprehensible speech. At a critical moment, three-year-old Sizi, traveling with Empress Zhangsun, was drawn to the modern candy, still in its wrapper, that fell from his arms. She cried for “the sweet thing wrapped in colorful paper,” accidentally getting Lin Yan out of trouble.
Relying on his knowledge of history, Lin Yan temporarily claimed to be “the descendant of a reclusive scholar from Jiangnan, stranded here by war.” He earned a measure of trust by using basic first-aid knowledge to treat a minor bump on Sizi's head. Li Shimin arranged for him to stay in the palace for the time being, though in truth he was keeping an eye on him. During this period, Lin Yan repeatedly used the cooldown between transmigrations to return to the modern day and research early Tang court etiquette and historical details. He also brought a small number of modern items back with him, such as antiseptic wipes, vitamin tablets, and simple picture books, gradually winning Sizi's trust and affection.
Using his modern knowledge, Lin Yan helped the court solve minor sanitation problems, such as disinfecting water sources, attracting the attention of Li Shimin and Fang Xuanling. In the modern world, he began organizing the information he had brought back from the Tang Dynasty and writing related academic papers, earning his advisor's approval. When Sizi suddenly fell seriously ill with something like pneumonia and the Tang physicians were helpless, Lin Yan risked returning to the modern day to look up emergency treatment. He brought antibiotics back to the Tang Dynasty, disguised in special packaging, and with Empress Zhangsun's covert support, successfully helped Sizi recover. But his “mysterious ability” also aroused the suspicions of more and more people…
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