If it were merely a group of supreme powerhouses from the myriad worlds and the Beyond looking for traces of Yun Qingyan, he might not have known about it before being discovered.
But as news of this spread throughout the Beyond, it became virtually impossible for him not to find out, provided he was still within those lands. Unless, of course, he happened to be in deep seclusion, oblivious to the outside world.
"Brother Duan Lingtian..."
Chapter 4173