Zuo Shuang 左爽, also called Zuo Hua 左華, helped Chen Zhen 陳軫 who was accused of high treason by Zhang Yi 張儀 of Wei 魏. Zhang's charge was that Chen still sided with the king of Chu 楚, his old employer. Zuo Shuang convinced the king of Chu to call Chen Zhen back.