Zheng Yuandong is the Sect Leader of Spirit Stream Sect. He was the eldest disciple of the previous Sect Master and after his death Zheng Yaundong inherited the Sect Master's position. He is the senior disciple brother of Bai Xiaochun. It is said in chapter 269, that he is at the Great Circle of Foundation Establishment.
He looked to be of upper middle age with a heroic temperament. He is very cunning and knows how to control the situations. He thinks highly of Bai Xiaochun and knows how to control him or motivate him.