The Scientific Codex

Samuel, a covert scientific officer, was betrayed and died with a blade driven through his back and a lifetime of regrets… only to wake inside the frail, poisoned body of a noble child. With strangers calling him young master, assassins calling him a target, and demons apparently going crazy to murder him over a bloodline he never applied for, survival becomes an immediate priority. In the middle of this chaos, a mysterious wanderer saves him and whispers the one thing Samuel never expected to hear again: there is a way back to his old world. Now he must track the only soul who knows the road home, all while outrunning a hidden demon clan, avoiding monster hordes that are tearing cities apart, and surviving an interspecies war where humanity seems to be on the losing end.

Samuel lived and died for lies once. In this world, he intends to write his own truth, even if he must rewrite the laws of reality to do it.