source:https://www.soompi.com/2017/07/02/leader-wants-dispel-misconceptions-boy-group-wows-king-masked-singer/
MBC’s “King of Masked Singer” revealed the identity of “Smart Smurf” as the leader of a boy group that has been hurt by people’s misconceptions about the group.
During the episode that aired on July 2, the second round featured a battle between “Smart Smurt” and “Let’s Go Stingray.” The first contestant performed Im Chang Jung’s “Love Again” while the second person sang Buzz’s “Travel to Me.”