The Entry

Right outside one of the 81 entrances of caves, Zhang Tie saw the same mark. However, this entrance was emitting a hot flame as high as dozens of meters while being surrounded by a lot of knights. They appeared to be waiting for a proper moment to enter it. The moment Zhang Tie and Bai Suxian arrived, a knight from Lord Guangnan's Mansion who had long been waiting here flew towards them.

"Princess, Guye, I, Bai Yuanan, have been waiting for you..."

As the relation between Zhang Tie and Bai Suxian had been fixed, all the myrmidons and knights in Lord Guangnan's Mansion called him Guye instead of Qianji Immortal as the former one sounded more intimate. 

Zhang Tie had indeed seen this knight in the banquet two days ago. He was a myrmidon of Lord Guangnan's Mansion. Bai Suxian's third uncle was in the hole. After being told that Zhang Tie and Bai Suxian were coming, he especially had a knight wait here for him.