His appearance is that of a medium stature old man dressed entirely in purple.
Zi Ji first meets Yun Che a few days prior to the Seven Nation Ranking Tournament where he helped Yun Che deal with an unruly Divine Phoenix Sect disciple. After Yun Che lights up the purple crystal, Zi Ji invited him to the 7th floor to talk. He sold Yun Che a Heavenly Brahma Jade for seven thousand eight hundred purple profound coins. He agreed to assist Yun Che in trying to locate Chu Yuechan and also informed him about Xia Yuanba.