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Luo Zhiyao guards the "Secret Key Shop" left by his grandfather, but is forced by his eccentric mother and vampire brother to sell the shop in an attempt to steal the mysterious pocket watch left by his grandfather. During the dispute, the pocket watch shattered, and the blood from her fingertips fell on the dial, accidentally awakening the secret key of time - an artifact that carries the magic of ancient time, can look back on the past, repair all things, and also hides unknown secrets of time and space. The former docile persimmon fully awakened, and used the magic power of the secret key to tear apart the hypocritical mask of his family. After meeting Lin Sen, who was on a mission, he learned that his grandfather's death was closely related to the time and space conspiracy of the villain Zhao Kun. The two work together to use the magical power of the time key to unlock ancient clues, fight against time and space conspiracies, and step by step reveal the truth about Zhao Kun's tampering with time and space and murder of his relatives, and protect this secret that spans time. With no love brain and no female rivalry, the heroine uses the magical secret key to counterattack and fight back. As time goes by, she becomes her own backer and protects everything left by her grandfather.