Strange Tales of Green Mountain

Blurb 1

Monsters, spirits, ghosts, immortals, and demons all dwell across the Nine Provinces.

Humans have the Office of the Imperial Censor for Subduing the Strange, while demons have the Bureau of Rectification and Investigation. Both are renowned, their names known to everyone.

Gu Shanqing suffered a tragedy in childhood and learned the art of driving out spirits. He has captured walnuts that eat people, investigated the dark ghost in an attic, stepped into dreams, and entered paintings. Yet he has discovered that compared with monsters and demons, the human heart is far harder to fathom. The colleagues he knows well are each hiding their own motives, and the newcomer he thought he had just met turns out to be an old acquaintance...

Blurb 2

Once upon a time, a young gentleman died suddenly. On the day of his funeral, white paper fluttered across the sky, and his relatives, friends, and acquaintances all came to mourn him. But just as they were about to lower the coffin into the earth, it suddenly grew so heavy that no one could move it. Nobody knew what to do. After an unknown length of time, a man came galloping urgently from the end of the road. He leaped from his horse, threw himself over the coffin, and wept. When he had finished crying, the coffin grew light, and the dead man was finally laid to rest. Tell me, what is this story about?