Lin Ce, a 28-year-old former special operations team member, has been deeply involved in the history of the Qin and Han Dynasties for 10 years after retiring. He is a top enthusiast of the Chu-Han hegemony. He died suddenly while staying up late to compile "The Complete History of Xiang Yu's Defeat". His soul traveled to 210 BC and the 17-year-old Xiang Yu who just said "he can be replaced" has an omniscient historical perspective + modern military fighting concepts + Xiang Yu's own top-notch military force.