Only Yu Wen knew the whereabouts of Jiang Yi's mother; the Buddha Thearch had also said that Jiang Yi had seen Yu Wen before.
Jiang Yi had indeed seen the Xuan Thearch on Mystic Divine Mountain. Furthermore, the Xuan Thearch was very strange then; he did not attack the Mystic Divine Palace or became enemies with Jiang Yi. He had just stood there like a spectator. Now that Xing Mo had also said that the Xuan Thearch's mystical ability was not of the Stellarsky Domain, that could only mean it was something that Yi Piaopiao had taught the Xuan Thearch.
Yu Wen was a pseudonym!
Jiang Yi had seen Yu Wen's appearance twice. It was obviously different from how the Xuan Thearch looked like; that meant he was in disguise back then. After Jiang Yi thought about everything that had happened, suddenly many things started to make sense.