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Delivery boy Zhang Fan accidentally traveled to Daqin Chaotang, connected to the modern 749 station with a mobile phone, and started a journey of changing his life against the odds. He offered potatoes to solve the famine, built blast furnaces to smelt steel, promoted the imperial examination to break the monopoly of clans, and used the "three-three system" to defeat three thousand elites with one thousand soldiers and horses. Every time history is changed, it feeds back to modern China - the average life expectancy has soared from 83 to 88 years. When Qin Shihuang saw the world map and set his sights on the island country of Japan, a showdown in national destiny that spanned two thousand years officially began.