What makes The Ruby by April notable?

'The Ruby' marked a significant moment for April as it debuted at number 12 on the Gaon Album Chart, reflecting their rising popularity. Additionally, tracks like 'Oh-e-Oh' received positive reviews for their catchy hooks and innovative production, contributing to a growing fanbase both domestically and internationally. Released on October 16, 2018, 'The Ruby' is April's fourth extended play, showcasing their artistic growth following their previous release, 'Eternity.' At this point in their career, April was refining their sound while seeking broader recognition in the competitive K-pop landscape.