While investigating a bizarre murder case, investigator Huang Jingcheng was drawn into a rift in time and space and traveled to an ancient Eastern country that was completely different from historical records. Here, Cthulhu-esque indescribables lurk in the shadows, and myths are nightmares of reality.
Relying on his modern criminal investigation thinking and his special ability of "abyss gazing", he became a non-staff consultant for the government's secret department, specializing in cases that "should not exist". In the process, he met Long Yuran, a descendant of a mysterious family of exorcists. She is powerful, cold, and masters the art of sealing that has been passed down for thousands of years. She has gone from being wary of him, a "foreigner" with weird words and bizarre methods, to being on her side.
When the ancient evil awakened from the deep sea, and the boundary between reality and madness began to melt, Huang Jingcheng discovered that his journey through time was not accidental. He is not only a witness, but also a key. The ultimate secret guarded by Long Yuran may be closely connected with the fate of the two of them, as well as the survival of the two worlds.
