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"What's going on?" "Beheading Pound in Jin?" "Mi Fang and Fu Shiren won't surrender?" "Wei and Wu couldn't defeat Jingzhou even with the whole country?" "Isn't Guan Yu dead?" "Wait a minute, why did the Four Kingdoms appear again?" Han Qing, who traveled back in time before the Battle of Xiangfan, was asked to rescue Guan Yu and help Liu Bei unify the world. This time, let's see how chemistry teacher Han Qing turns the tide...