Singing classic hits of the '80s and '90s, contestants compete to win hearts and become the nation's next oppa! Ji Hyun-woo, Kim Gu-ra, Park Kyeong-rim, Koo Chang-mo, Byun Jin-sub, Kim Won-jun, Min Hae-kyung, Joo Young-hoon, Lee Bon, Bae Hae-sun, Narsha, Kim Soo-chan Added on Netflix 2023-10-07.