Episode 4

Lee Seung-chul

Self - Mentor

Kim Jae-joong

Self - Mentor

WENDY

Self - Mentor

Young K

Self - Mentor

Yoshihiro Akiyama

Self - Mentor

Yu-sin

Self - Contestant

Kim Dong-won

Self - Contestant

박준성

Self - Contestant

최하람

Self - Contestant

양태선

Self - Contestant

권의빈

Self - Contestant

Kim Yeon-kyu

Self - Contestant

이진

Self - Contestant

조용환

Self - Contestant

조윤찬

Self - Contestant