Xiao Han, a retired upper class soldier from "PLA", was thrown into the time-traveling army by the mysterious force from the east (zuo) direction (zhe), and became a half-player, half-NPC existence. Back before the public beta of Yuhami's Unreal V masterpiece "Star Dragon", he was forced to choose (no choice) the most difficult soldier type.
Across the world of Star Dragon,………………!
If the players hadn't appeared, this book would have been a serious theme of traveling through other worlds...
As an NPC, it has all the functions for players... Publish tasks? Favorability adjustment? Teach skills?
I seem to know all these players, and the real world has returned to before the open beta.