Uploaded after the show aired last night, the man by Seung Gi is the engineer for the show and from the hashtags, he and Seung Gi debuted at the same time.
“#Soundmind #LeeSeungGi #EungStagram #Engineer #OneNight’sTVEntertainment Debuted as an engineer together with Lee Seung Gi. Hehe”
Korean to English translation by Elise, Lee Seung Gi Forever