In literature, "yeah" functions as a dynamic marker of informal speech, capturing everything from enthusiastic affirmation to skeptical hesitation. Writers use it to create realistic dialogue, as when a character casually confirms a point—"Yeah, Pop, I was one of the button-pushers" [1]—or to inject subtle irony in responses like the measured "Yeah, that's right," which can hint at resignation or uncertainty [2]. At the same time, its use in challenge or inquiry, for example, the terse "Oh, yeah?" [3], shows how a simple term can evoke complex character emotion and nuance. Whether employed in light-hearted banter, regional dialects, or even to punctuate dramatic exchanges as in the emphatic "Yeah!" [4], the word consistently serves as a versatile tool for conveying authenticity, immediacy, and varied tonal inflections in narrative dialogue.