The World's Finest Assassin Gets Reincarnated in Another World as an Aristocrat - S01

The world's greatest assassin devoted his life to the organization that trained him, only for them to betray and kill him. Filled with bitterness and regret, he is approached by a goddess drawn to his unmatched skills. She offers him a second chance in a world of magic and swords, where he must complete a vital task: save this world by killing its hero before he destroys it. Reborn as Lugh Tuatha Dé, the son of a noble family of assassins serving the Alvan Kingdom, Lugh trains under his father's guidance. This time, he learns a more refined approach to assassination, unlike the ruthless methods of his past life. Along the way, his talents flourish, helping him forge new bonds. But Lugh understands that none of this will be enough-to defeat a hero of such overwhelming power, he must become flawless.