Xie Ye's Soul Domain.
When Gui Lan saw the adult man sleeping and chained especially his appearance he could help but uttered a name unconsciously, "A'Xia?"
Just based on his reaction Gui Lan obviously knew that man before him. The chains were connected in all corners of the domain but the fogs in the place made it unable to see the exact location where the chain ends. Gui Lan continues to watch the chained man before him. There's only a meter distance before the adult and the child.
