Lee Seok-hoon

as Self - Master (13 episodes)

as Self (10 episodes)

as Self - Judge (10 episodes)

as Self (1 episode)

as Self - Panelist (12 episodes)

as Self (3 episodes)

as Self / Vocal Master (12 episodes)

as Count Axel von Fersen

as Self (12 episodes)

as MC (75 episodes)

as 음악 선생님 (10 episodes)

as Guest (1 episode)

as Self - Judge (12 episodes)

as Self (9 episodes)

as Regular Member (11 episodes)

as Self (3 episodes)

as Vocal Mentor (12 episodes)