Jianwang 3 has been around longer than the An-Shi Rebellion. Changes to the core team led to conflicting timelines in the game and contradictions in the story, making retcons in new versions the norm. A small world that evolved from the game Jianwang 3 was also on the verge of collapse for the same reason. The System that had constructed and organized this world had completely broken down. It was like a university student in agricultural science discovering that data from someone else's thesis in a completely different field had overwritten their own. So the System decided to pick a few players and send them into this world. Let bugs collide with bugs, and maybe things would stabilize. Gu Yan and the others were lucky enough to be caught as bugs. But since they were here already, they might as well stir things up.
Ju, remember this! I'm not the same little cupcake you once made cough up blood anymore! I'm going to change everything that happened!
Fanfiction, with no logic. Don't think too hard while reading.