In February 2015, EXID's Solji participated in a singing competition program, MBC's King of Masked Singer (Mask King) for their pilot episode, and became the first winner of the show, impressing the panel of judges as well as viewers.
In February 2015, EXID's Solji participated in a singing competition program, MBC's King of Masked Singer (Mask King) for their pilot episode. She appeared as Self-Luminous Mosaic and defeated singer and comedian Shin Bora and trot singer Hong Jin-young, and became the first winner of the show, impressing the panel of judges as well as viewers.