A "list" connects several people who would not have had much intersection in their lives.
The "unexpected death" of their parents, the occurrence of strange events around them, and the spying from the dark... These made the four of them choose to become detectives as if they were drawn by fate.
The only difference is that some people choose the bright side and use the official intelligence network to explore the past; some choose to run in the darkness, like dragons in deep water; and some choose to swim at the junction of black and white, with only a thin line between morning and dusk; and some people have no choice and become puppets controlled by invisible threads. Some of them knew each other, but then parted ways and became strangers; they came together for a common purpose, and then went their separate ways after the dust settled.
So everything starts with the "list" and ends with the "list".
Note:
1. Yes, the introduction contains false elements, so you can take your time and guess.
2. The detective concentration is too high hhh, but this is just a practitioner wearing a reasoning shell and a GB romance work (run away with the draft)
Purpose: To be a good citizen who abides by laws and regulations.