Reborn in 1839? I Evolved into a Divine Dragon

Hot-blooded young man Zhao Ba is killed while trying to help someone in danger, then is reborn in 1839 as a snake, at a time when the people are suffering terribly.

His body undergoes a mutation, giving him the ability to evolve without limit. In the end, he transforms into a divine dragon, defending his homeland and defeating the invaders.

(The blurb doesn't do it justice. Read the story.)