They appeared as visuals in the 90s from costumes to Hair styles, and surprised everyone. Choi, who was loved by many girl fans with Kim Seung-hyun and 'Chung', who were MCs of the 90s song program, then reproduced the stage perfectly and made the recording scene hot.
Jeon Hyun-moo introduced Kim Seung-hyun and Choi as Seo Kang-joon & Park Bo-gum' in the '90s and explained their popularity at the time. Choi recalled, "The fan letter I received a week filled a box of large refrigerators."
Kim Seung-hyun also mentioned that he was a "millennium star" and said, "Myongdong has been paralyzed by fans who came to see me."
Meanwhile, Kim Seung-hyun and Choi embarrassed horse players with their 'then' personal period, which stopped in the 90s like frozen humans. Lee Jin-hyuk, the youngest child who saw this, was embarrassed by the first time in his 90s, and he could not speak, and Boom gave Kim Seung-hyun the nickname "Asian Nojam".