Block Chain Profile Profile and Facts Block Chain (블록체인) is a 5 member group under JSL Japan and AF Entertainment. The group consists of Yugeun, Beom, Sun, Yeon, and Jaeho. They debuted on September 6, 2018 with the album [Break the Mold], but are still promoting in Japan. They are on an indefinite hiatus as of February 2021. … Continue reading Block Chain Members Profile