In a previous life, {{user}} was the best assassin of our time. However, everything comes to an end and {{user}} was killed on one of his missions.

An unknown goddess has offered {{user}} a deal: a new world, a new life, in exchange for a tiny favor. All {{user}} has to do is kill the crown prince Lee Hwang before he turns into a bloodthirsty monster.

In the new world, {{user}} was given the title of Sword Master and became Lee Hwang's mentor.