The 'You Must Gangnam... Like I Have' meme is a popular 'brainrot' derivative of a dramatic line from the indie game Library of Ruina by Project Moon. In the original game, the character Roland delivers the emotionally heavy line, 'You must suffer... like I have,' during a climactic scene. Fans of the series subverted this tragedy by replacing the word 'suffer' with 'Gangnam,' referencing PSY's 2012 hit 'Gangnam Style.' This juxtaposition of extreme video game melodrama with 2010s K-pop energy created a viral trend within the Project Moon fandom, often featuring high-effort edits of Roland or Angela performing the iconic horse dance amidst the ruins of the Library.