This is the nuclear option of the genre. The MC reincarnates into an RPG world and chooses the "Merchant" class—considered the weakest mob role. But his "Appraise" skill shows him the "source code" of reality. His "Sell" skill can trade concepts (e.g., "I sell the enemy’s existence").
By Chapter 10, the revenge plot collapses. The Duke cannot kill anyone because Carlo publicly thanks him for "being such a sweetheart." The villainess becomes a famous actress because Carlo's earnest, tearful applause makes her look sympathetic. The original author of the revenge story (who reincarnated as a cat) gives up. This is the nuclear option of the genre
This refers to a growing subgenre of manga (often isekai or fantasy comedy) where the protagonist is supposed to be a background character — but due to being absurdly overpowered without realizing it, they completely break the intended storyline. Hilarity and chaos ensue. His "Sell" skill can trade concepts (e