Daqin: My Identity as an Agent Has Been Activated

In 239 BC, before the enthronement ceremony of King Qin Yingzheng, there were six Shandong kingdoms looking at him from outside, and there was an undercurrent surging inside. System activation, mission: clear the obstacles for King Qin! After rebirth, Ying Ziyu has been hiding for nine years. Since he was a child, he was sent by the late king to sleep in the six countries and learn the thoughts of hundreds of schools of thought. He is Ying Zheng's younger brother, a chess piece hidden in the dark, always ready for unexpected events. Even the King of Qin doesn't even know about this solitary piece of his existence. This is an agent. Before his death, the late king asked him to remember one sentence: Remember, from now on you will be a sharp sword hidden in the dark. The Qin Dynasty does not need you, so you should continue to endure it. When the Qin Dynasty needs you, with this token, you can control the three armies! Return to Da Qin! Eliminate the prime ministers, build water conservancy, recruit good ministers, destroy the six kingdoms, and unify China. Ying Ziyu, who awakened the system, developed his own system step by step with the development of the Qin Dynasty's national destiny. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.