I am looking for a manhwa webtoon about how a high schooler became super famous using an app that makes him look more better looking. Apparently at the beginning he was being jealous of this good looking guy on social media but found out he was using the beautifying app and turns out he was a short and fat guy. The main character was confused and his sister showed him the app and he used it on himself by singing and dancing and became very popular.

Nvm I found it "Ganji Monster"