Super Mechanic

Han Xiao, a hardcore power leveler of "Star Ocean", was thrown into the time-traveling army by a mysterious force from the East. He carried the player's panel and became an NPC. He returned to the time before the public beta of "Star Ocean" and resolutely chose the most difficult mechanical system.
Warships lined up across the starry sea, star mechas were as agile as dragons, psionic cannons destroyed the world, and there was an endless mechanical army quietly staying in the portable warehouse
One person is a legion!
If it weren't for the players, this book would be a serious and serious theme of time-traveling in another world...
As an NPC, normal NPCs have all the functions for players... Issue tasks? Adjust favorability? Teach skills?
The most beautiful girl in e-sports? Just want to learn skills? Goodbye, I sell myself, not art
Wait, how come I know all these players
The real world has also returned to ten years ago.