Yang Qing was caught a little off-guard by Ye Xun's statement as his brows raised a little in wonder at who the guest might be.
The fact that Ye Xun called them a guest meant it was someone familiar to him or her. As he made his way outside the alcove to see who it was he went through the possible list of suspects.
At first, the mountain jade serpent appeared in his mind, thinking that maybe he had decided to come after all, but Yang Qing dismissed that idea when he remembered he likely didn't know the area all too well. By his own admission, the mountain jade serpent did admit to never leaving the mountain he lived at ever since he was a rock python.