Lin Xiaoyu, a chemical researcher who has had muscular atrophy for five years, time traveled through time due to a rehabilitation accident and became the secret guard commander of Xiao Chengyu, the ninth prince of the Dayu Kingdom. He was bound to the "Tianji System" and gained a healthy body for three years. His mission: to rewrite the fate of the Prince of War who was poisoned, otherwise his body will decay and die.
Modern science collides with ancient intrigues, and she uses chemistry as a blade - phenolphthalein reveals the secret letter of the fifth prince, concentrated sulfuric acid breaks the secret guard's assessment, fluorite resists the poisonous poison of purple ashes, and deals with the poisonous schemes of the hypocritical prince Xiao Chengqian, the ambitious fifth prince Xiao Chengyan and the enemy's female spy Wusuna. Xiao Chengyu, the cold-faced god of war, looks stern, but his defenses are shaken by her words, "The abdominal muscles can react with flames." The magnet map and copper bell code in the secret guard camp make him gradually believe that this "unconventional" commander can reverse the prophecy.
When the blood book in Leng Gong reveals the secrets of the royal family, when cracks in the system warn of the depletion of time and space energy, Chu Li cuts off his fingers, and Su Wan tests the medicine, Lin Xiaoyu discovers that changing fate requires paying for soul fragments. At the end of the countdown, she put on a white coat and used "H₂+O₂=H₂O" to persuade the enemy to surrender. She blocked Xiao Chengyu's arrows in the Jinluan Palace. Before she died, she drew an atomic structure on his palm: "This is the star of my hometown."
Scientific wisdom rewrites the direction of political strategy, and two-way redemption transcends the boundaries of time and space. She is his "catalyst", allowing the Iron-Blooded War God to learn to trust and rely on; he is her "stabilizing key", allowing the sick and weak soul to shine in ancient times. In the fluorescence of the fluorite, a legend is written with elemental symbols, and an equation that will never fade is engraved in the history books of the Yu Kingdom.
