What makes The Book of Us: The Demon by Day6 notable?

The album features 'Zombie', which became a viral hit and resonated with fans due to its relatable themes during the COVID-19 pandemic. The project not only reached significant chart positions within South Korea but also marked Day6's continued growth in international recognition, especially among international K-pop audiences. Released on May 11, 2020, 'The Book of Us: The Demon' is Day6's fifth mini-album, showcasing their evolution as a band following their successful previous release, 'The Book of Us: Entropy.' At this point in their career, they had solidified their identity in the K-pop scene while exploring deeper lyrical themes and varied musical styles.