I once read an old novel in which the protagonist picked up a helmet from the future world. When he put it on, he was in the world represented by the helmet. Was he the only one around?

I recommend the novel "Super Helmet for Online Games" to you. The protagonist is a university student who can't find a job. After being taught a cultivation technique by a mysterious old man, he pre-ordered a VR gaming helmet online, but he was alone after entering. This novel is about virtual games. I suggest you read the seven chapters or at least the prologue to better understand the game settings. I hope you like my recommendation. Muah ~