Xu Qing, of course, knew who Yu Yangzi was, the former persona of Xuantian Taoist and Red Moon, one of the Northern Seven Masters under the Chongyang Sect, known in the worldly society as "Iron Foot Immortal" Wang Chuyi.
For example, the renowned Dragon Knight Yin Zhiping was taught the Lu Technique from Yu Yangzi.
Certainly, in real history, Yin Zhiping was highly skilled and became the Master of the Quanzhen Dao. He first met Ma Yu, which ignited his heart towards Dao, later became a disciple under the immortal Qiu Chuji, studied I Ching from Hao Datong, and received the Lu Technique from Yu Yangzi.
Such sequence in entering the Dao could be said to be impeccable.
Xu Qing pondered for a moment and said, "It's actually Yu Yangzi's remains here, not Xuantian Taoist's; this is very strange."
Feng Wu deeply agreed.
Something was terribly off.
Xu Qing approached Yu Yangzi, firstly performed a disciple's bow with full formality, then touched Yu Yangzi's remains.
"This..."