라키

If you’re unfamiliar with Rocky’s voice, here are the other reasons fans are speculating that it’s him aside from the vocal: 

contestant name = 불효자는 웁니다  meaning undutiful son. could potentially refer to rocky growing up apart from his mom or the fact that he couldn’t tell his mom about the schedule (which he usually does) due to anonymous identity

a panelist said he sings like he’s had vocal training/is a currently promoting idol

did a double handed “wanna be your star”

contestant’s special talent is “dance”, challenged other contestant to dance battle where he did this

in the preview for next week, did spins as his special talent

similar hand gestures/posture when singing

similar breathing pattern when singing

looks to be wearing 2 rings under his gloves

same dance moves as rocky wycmn rap

standing like rocky