BTOB-BLUE is an electrifying subunit of the well-known boy group BTOB, showcasing the extraordinary vocal talents of Eunkwang, Changsub, Hyunsik, and Sungjae. Making their debut on September 19, 2016, with the mesmerizing digital single "Stand By Me", BTOB-BLUE has captured the hearts of K-pop enthusiasts worldwide with their harmonious sound and captivating performances.