In the shadows of the city, there is a group of people dealing with "the invisible things".
The Neng Investigation Bureau, whose full name is the "Special Investigation Team of the Archives Bureau", superficially deals with old files, but what it actually deals with is "Jialo" - a supernatural being generated by human obsession and resentment. The red ones are bloodthirsty, the green ones are parasitic, and the gray threads are entangled. They are lurking in the corners and alleys, waiting for the next host.
Newcomer Ding Lingling encountered the Huichun Hall murder case on her first day on the job. The deceased Li Dechang was bleeding from all his orifices, but there were no signs of a fight at the scene. Visionary Xu Xinyi saw a scarlet figure lying on the shoulder of the deceased's nephew - it was Hong Luo, grinning.
As the investigation deepened, a man named Jiang Yanzhi suddenly broke in. He claims to be a medicine merchant, but he knows Jia Luo well and can even purify Hong Luo with his bare hands. What makes Xu Xinyi even more uneasy is that he seems to know herself - and in her memory, there is a gap torn by the "grey line of resentment" three years ago.
The midnight singing in the textile factory, the ivy parasitism in Soul Locking Village, the illusion of twenty reincarnations in Guanhai Building... Behind every case, they point to the same name: Fei Ji. She is a high-ranking Jialuo who controls illusions and memories. She was also Jiang Yanzhi's lover in his previous life.
And Xu Xinyi gradually discovered that the remnant soul of Fei Ji lived in his body.
When the truth is peeled off layer by layer, what awaits them is the final showdown in Guanhai Tower, and it is also a battle of obsession and redemption that spans a hundred years.
——Some obsessions turn into Jialuo; some affections are immortal in reincarnation.
