The story mainly takes place in a giant vertical city called "Rock City". The city is a giant, rusty metal hive, stratified strictly by credit. At the top is the "glazed dome" area, which is always bright. In the middle is the "Beehive" commercial and residential area, with holographic advertisements running day and night. The ground floor is a winding "rust belt" and "pipe zone" that receives filtered waste heat, waste liquids and waste products, and is also the location of the data dump. Guo Fuji is a survivor of a failed "advanced cognitive enhancement prosthesis" implantation experiment. His special ability is "psychological suggestion", which is an innate, intuitive talent without systematic training. He is not able to directly control other people's thoughts, but can extremely keenly sense the "weak points" or "resonant frequencies" of other people's emotions and cognition, and exert subtle influence through words, actions, and even silence, changing the other person's focus of attention, emotional background, or preliminary judgment on something. Excessive use of this ability will cause severe headaches, sensory overload, and easy backlash, making him passively involved in the opponent's strong emotions. His sociophobic and introverted traits protect him to some extent from the abuse of abilities and mental depletion caused by excessive social interaction.
