If it were the world of the Huaxia State, or perhaps the Han State, Xiaotian could receive help from across the globe. But this world was not yet unified, so every step he took was met with obstacles.
"Sigh... I lost track of time."
Xiaotian had been so absorbed in technological research that he lost all sense of time; otherwise, he wouldn't have returned in the year 2000.
Chapter 398