LoginCast and credits of Opera Star
Starring
Dong-wook Kim
Himself (7 episodes, 2011-2012)
Ki-Young Park
Herself (6 episodes, 2012)
Jung-hee Lim
Herself (5 episodes, 2011)
Hee-wok Moon
Herself (5 episodes, 2011)
Ji-hyeon Park
Himself (5 episodes, 2012)
Chang-ryeol Kim
Himself (4 episodes, 2011)
Jong-seo Kim
Himself (4 episodes, 2012)
Sunday
Herself (3 episodes, 2011)
Hye-chul Shin
Himself (2 episodes, 2011)
Soon-won Jung
Himself (2 episodes, 2012)
Soo-mi Jo
Guest (1 episode, 2011)
Soo-yeon Kim
Guest (1 episode, 2011)
Yoshikazu Mera
Himself (1 episode, 2011)
Jung-hak Seo
Mentor (1 episode, 2011)
Kyeong-mi Han
Mentor (1 episode, 2012)
Yong-kap Jo
Mentor (1 episode, 2012)
Joo-hee Lee
Herself (1 episode, 2012)
Kyeong-jae Lee
Jury (1 episode, 2012)
Sang-hyeon Park
Conductor (1 episode, 2012)
Hee-tae Seo
Jury (1 episode, 2012)