1. "Mirror City": The story mainly takes place in a modern metropolis called "Mirror City". This city is bright and beautiful, but the underground network, gray industries and human desires are intertwined into a huge maze, like two sides of a mirror.
2. "Abyss" forum: An anonymous darknet forum that wanders on the edge of the law and is a breeding ground for all kinds of secret transactions, conspiracy planning and evil. The clues of many bizarre cases vaguely point to this. Ling Qi is a frequent visitor here, but he only pursues the truth.
3. "Memory Fragments": In the process of investigating his unjust case, Ling Qi found that his memory of key events was confused and missing. With every case he solves, he seems to be able to recover a "memory fragment" about his past, and the truth is far darker than he imagined.
