Fan Wuji

Huan Yi (桓齮 Huán yǐ) (died 227 BC), who lived during the Warring States period, was a Qin general who betrayed his state. He escaped to the state of Yan and later committed suicide to aid Jing Ke in the latter's assassination attempt on Ying Zheng, the king of Qin. He is portrayed by actor Lü Xiaohe in the 1998 film The Emperor and the Assassin and Wang Ya'nan in the 2004 television series Assassinator Jing Ke.