Yan Zheng

Yan Zheng (onyomi: Gen Sei) is a fictional member of the Yellow Turbans in Romance of the Three Kingdoms. He directly served under Zhang Bao before betraying him.

Romance of the Three Kingdoms
As the Yellow Turban Rebellion neared its end, Yan Zheng was among the many rebels hunted down by the combined forces of Zhu Jun and Liu Bei. Holed up within a castle at Yang Cheng, he realized that defeat was inevitable which led him to slay his commanding officer Zhang Bao and surrender.