The protagonist Lin Yu is a modern lover of history and fairy culture who accidentally traveled through time and became Qin Shihuang's half-brother Cheng Xi. At that time, due to the internal power struggle in the Qin State, Cheng Yu faced the crisis of being sent to attack Zhao. In fact, it was Qin Shihuang, Lu Buwei and others who wanted to use their swords to kill people. Lin Yu used his understanding of history to know that Cheng Long's death would be a disaster, and he was determined to change his destiny.
