Solji (솔지) is the leader and main vocalist of EXID. Heo Sol-ji first debuted into the Korean entertainment industry as a member of ballad duo 2NB, later working as a vocal trainer before officially becoming a member of EXID. Recognized as one of the best vocalists in Korea, including from surveys with industry insiders and also among the fans. In her career, after becoming the winner during the pilot episode of MBC's "The King of Masked Singer" program in 2015, Solji returned to the program 3 years later.