"Beautiful Liar" is a song recorded by the South Korean boy group Monsta X for their twelfth extended play Reason. It was released as the EP's lead single by Starship Entertainment and Kakao Entertainment on January 9, 2023. Background and release In December 2022, Monsta X announced their comeback by releasing the coming soon image of their twelfth EP Reason through their official SNS, in an intense black image and the release date announced on January 9, 2023. On December 20, the track listing was released, with "Beautiful Liar" confirmed as the lead single. Joohoney, Hyungwon, and I.M participated in writing its Korean lyrics, alongside Brother Su and Kim Eung-ju.

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