The Regressed Son of a Duke is an Assassin Novel

The Regressed Son of a Duke is an Assassin Light Novel
Description:
Cyan Vert, the greatest assassin of the continent.
After having been betrayed by his own brother, whom he had trusted all his life, he meets an pitiful end.
If I were given another chance at life, I would live it differently.
A life where I would achieve all the things I want, and trust only myself, without serving anyone else.
That is how I was given a second chance at life.
The Cyan Vert, a shadow who lived for others, is no more.
I will now pave a path on my own, for myself!
The Regressed Youngest Son Of The Duke Is An Assassin Novel,
회귀한 공작가의 막내도련님은 암살자