From a certain point in time, many old houses in the remote suburbs of Hanhai were abandoned for various reasons. After the owners left, other things moved in.
Investigators participating in the Ghost Pattern test started entering the mansion, leaving only Bai Xiao standing outside.
The remote suburbs were disaster areas where Abnormal Events often erupted. However, due to the sparse population, various investigative bureaus didn't send out people to check daily unless there was a specific report, which led to the filthy entities inside some old houses continuously growing through mutations.
The mansion beneath the Describing Research Institute was likely an old house from the remote suburbs, moved there in its entirety.
