A One-Man Survival Rule

[Western Fantasy + Single Female Protagonist + Academy + Group Portrait + Time Travel Game + System + Slow Heat] Traveling back to the game world he had played, Lin Yue only wanted to say one word, pit. He is not the protagonist, not the villain, and he is not even a supporting role - the original protagonist was a fallen nobleman who died in the second act. He didn't even have any lines and was purely used as a backdrop for the death list. Good news: He has a system that sees everyone's rarities. Bad news: The system is not cute, can't speak, and doesn't even give out gift packs for newbies. It also comes with a krypton gold mall, and he is extremely poor. In order to survive to the end, Lin Yue formulated a set of "two-part survival rules", not to cause trouble, not to stand out, and never to change the plot. Anyway, he would not save anyone who deserved to die in the original work, and he would not stop any plot that should happen. After all, once the butterfly's wings flap, there is no turning back.