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Baekhyun's EP "City Lights" sold more than half a million copies in 2019, making it one of the best-selling EPs of the year. The EP was released on December 10, 2019, and featured six songs, including the lead single "UN Village". The EP was a commercial success, debuting at number one on the Gaon Album Chart and selling over 500,000 copies in its first week of release.