The Regressed Son of a Duke is an Assassin

Humor and Lighthearted Moments Despite its intense and dramatic tone, The Regressed Son of a Duke is an Assassin also knows how to inject humor and lighthearted moments into the story. The witty exchanges between characters provide a welcome break from the tension, offering readers a chance to smile or laugh. These comedic moments balance the darker themes of the series, ensuring the manga never feels too heavy. The humor is well-timed and often used to highlight the unique personalities of the characters.

Cyan Vert, illegitimate son of the duke and the empire's greatest assassin, is betrayed by the righteous brother whose shadow he's always lived in. But just before the fatal blow strikes his throat, Cyan awakes to find he's just a boy again. The young lord has been reborn, and this time, he's not going to live in anyone's shadow! (Source: Webtoon Entertainment)

Read manhwa The Regressed Son of a Duke is an Assassin / The Regressed Youngest Son of the Duke is an Assassin / 회귀한 공작가의 막내도련님은 암살자

[By the studio that brought you <Solo Leveling> and <Revenge of the Iron-Blooded Sword Hound> and <Solo Max-Level Newbie, and many more!]]
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 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!