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"A Hundred Days to Cast a Mirror" is an inspirational coming-of-age novel that tells the story of Li Kaijing, a third-year junior high school student, who went from being the 1,900th-ranked bottom student in the county when he was one hundred days away from the high school entrance examination. After 100 days of hard work, he finally achieved a counterattack.

At the end of the Gaowu world, the spiritual energy of heaven and earth was exhausted (the Age of Ending Law), and martial arts declined. An ordinary bodyguard in a small bodyguard agency accidentally got an ancient secret book "The Sutra of Nirvana Sword" that does not require spiritual energy and only cultivates "qi, blood", "will" and "sword intention". In the fight between life and death, in extreme pain, and in the screams of all living beings, he realizes the meaning of the sword and lives towards death.

Yu Chuan, a 55-year-old education expert, travels back to Yu Chuan, a 25-year-old low-level teacher, to interpret an aggressive life.