The Path of Immortality: Starts With Creating Water Bear Gu - Chapter 244: The Idea of Cross-Level Alchemy

Ling Xiao was a powerful martial expert who fell in battle and was unexpectedly transmigrated into another world. He began life anew in the body of a boy with the same name, a fallen genius of the Ling Family whose cultivation had been crippled in a surprise attack, and son to a father who had also suspiciously been crippled under similar circumstances. Armed with knowledge from his previous life, Ling Xiao aim to restore his strength and establish his place at the top of this new world

- Description from Novelupdates

An Individual from Earth finds themselves in the Shinobi World, equipped with a Scientific System. From that moment, he delved into scientific research far ahead of its time.

When we met for the first time in our first year of high school, he saw my contempt, but silently continued to clean;

Cao Gui: “Well said! System, but do you want to explain why this is not Marineford but Manhattan in New York?”

System: “…”

Cao Gui: “System?”

System: “…”

Cao Gui: “System, say something!”

- Description from Novelupdates