BTS’ Suga is the latest member from South Korean pop group to announce a debut solo album, D-Day, under his alias Agust D. BigHit Music announced that D-Day will drop on April 21. The album is the third-and-final release in a trilogy of Suga-as-Agust D’s music, following 2016’s Agust D and 2020’s D-2 mixtapes. “SUGA…