text: Lao Ai's attempted coup As King Zheng grew older, Lü Buwei became fearful that the boy king would discover his liaison with his mother, Lady Zhao. He decided to distance himself and look for a replacement for the queen dowager. He found a man named Lao Ai. According to The Record of Grand Historian, Lao Ai was disguised as a eunuch by plucking his beard. Later Lao Ai and queen Zhao Ji got along so well that they secretly had two sons together. Lao Ai was ennobled as Marquis Lào Ǎi, and was showered with riches. Lao Ai's had been planning to replace King Zheng with one of his own sons, but during a dinner party he was heard bragging about being the young king's stepfather. In 238 BC, while the king was travelling to the former capital, Yong (), Lao Ai seized the queen mother's seal and mobilized an army in a coup attempt. When notified of the rebellion, King Zheng ordered Lü Buwei to let Lord Changping and Lord Changwen attack Lao Ai. Although the royal army killed hundreds of rebels at the capital, Lao Ai successfully fled the battlefield.
  A price of 1 million copper coins was placed on Lao Ai's head if he was taken alive or half a million if dead. Lao Ai's supporters were captured and beheaded; then Lao Ai was tied up and torn to five pieces by horse carriages, while his entire family was executed to the third degree. The two hidden sons were also killed, while the mother Zhao Ji was placed under house arrest until her death many years later. Lü Buwei drank a cup of poisoned wine and committed suicide in 235 BC. Ying Zheng then assumed full power as the King of the Qin state. Replacing Lü Buwei, Li Si became the new chancellor.
  First assassination attempt
  King Zheng and his troops continued their conquest of the neighbouring states. The state of Yan was no match for the Qin states: small and weak, it had already been harassed frequently by Qin soldiers.  Crown Prince Dan of Yan plotted an assassination attempt against King Zheng, recruiting Jing Ke and Qin Wuyang for the mission in 227 BC.