The Regressed Son of a Duke is an Assassin summary:
Cyan Vert, the best assassin of the continent, meets a pitiful death after having been betrayed by his own brother, whom he had trusted all his life.
"If I were given another chance at life, I would live it differently. I would only trust myself, and achieve all the things I want on my own without serving anyone else but myself."
That is how he was given a second chance at life. The Cyan Vert, a shadow who lived for others, is no more. He will now pave a path on his own, for only him!