This quote comes from Jujutsu Kaisen and became especially popular through anime edit culture, where short, emotionally charged lines spread far beyond the original episode. Fans use "I'm you" in character analysis videos, villain parallel edits, and serious meme posts because the wording is simple but loaded with meaning. Its popularity stayed strong on short-form video platforms thanks to the combination of a recognizable anime source, a tense delivery, and how easily the line fits transformation, rivalry, and identity themes.