Urban life, folk culture, Cthulhu, a compelling story, maybe cultivation, mild horror, philosophy, literary flair. There will be some mystery along the way, in short: foreshadowing.
Yun Wudao is a victim, but he is also a murderer who has harmed others.
To put it more clearly, everyone is a culprit in a world that drives people to hurt one another, an abstract Cthulhu with no way to truly recognize their own problems.
Sorrow, arrogance, pain, separation: every kind of suffering makes people keenly aware of how insignificant they are.
When people are no longer human, they cross the most fundamental boundary of humanity, yet in the end, they all die because of their own arrogance.
The worldbuilding will be filled in later.
The early chapters may drag a little, but the pacing won't be especially slow.
