In the original era, Gu Zheng didn't have much contact with Xuan Yue. Before, because of his low cultivation level, he had been practicing outside. Later, when he came to the Ice Death Snowfield, he finally met his second senior sister Xuan Yue, but due to various things Because of this, he couldn't stay with Xuan Yue for long.
Gu Zheng knew that Xuan Yue was a demon cultivator, but Gu Zheng had not asked Tie Xian about her identity, and Tie Xian had not taken the initiative to talk about such a thing. Even if the later ancient battles have immortal-level changes (remember the website address: www.hlnovel.com