The line comes from Miraculous Tales of Ladybug and Cat Noir, the animated series that premiered in 2015. Adrien Agreste repeatedly describes Marinette as just a friend, despite her clear crush and their close bond, turning the phrase into a running gag among fans. Clips and screenshots spread through fandom edits on YouTube and TikTok, where the quote became shorthand for oblivious denial. It remains popular because almost any close friendship scene can be reframed with the same painfully blind delivery.