Conversation so far:
What was one of the solo activities that the members of the Brown Eyed Girls participated in?
Brown Eyed Girls' Miryo, released her self- produced solo album, MIRYO a.k.a. JOHONEY
Did other members of the Brown Eyed Girls have solo projects, besides Miryo?
Brown Eyed Girls' Narsha made her acting debut with MBC's drama Light and Shadow and followed by Ooh La La Couple
Did Gain from the Brown Eyed Girls have her own projects?
Brown Eyed Girls' Gain became a CEO of a public relations company called ‘Mental Breakdown' particularly for the show, OnStyle's Launch My Life – Ga In's Fashion King.“
What did the Brown Eyed Girls' JeA do as fas as solo projects?
Brown Eyed Girls' Jea also became a fixed member of Immortal Songs 2 but she later left the show due to her solo album promotions

Question: What was their digital single?
Self-contained rewrite: What was the Brown Eyed Girls' digital single?