Singer Solji attended the MBC Night - Mystery Music Show King of Mask Singer' recording at MBC Dream Center in Ilsan-dong, Goyang City, Gyeonggi Province on the afternoon of January 12th.
About King of Mask Singer
The King of Mask Singer is a South Korean singing competition program presented by Kim Sung-joo, with introductions by voice actor Lee Won-joon. It airs on MBC on Sunday, starting from April 5, 2015 as a part of MBC's Sunday Night programming block.
 Wikipedia