The secret vault is located in one of the six small surrounding buildings, and Feng Jun feels quite frustrated.
The Yin spirits have been setting things up here for over eighty years. Because the Wen Family occupied this land and carried out massive construction, the terrain has changed quite a lot, so it's normal for it to have trouble finding the location.
Feng Jun was observing the cultivation point for the Energy of Wooden Fiends, but the Yin spirit directly found the millennia-old Wooden Marrow Amber, and then made an accurate positioning.
This positioning is really somewhat difficult to swallow, but the good thing is: the secret vault is not in any particular room of the surrounding building, but on the empty land surrounded by the building.
Otherwise, Feng Jun would have to consider smashing through the walls of the house to enter and open the secret vault inside.
