[2] They would meet in a rented house where they could have a candid chat about issues and topics that they had not been able to speak about due to the closed and highly taciturn culture of the K-pop industry while they were active as members of their groups.
[3] Moon had proposed the concept of the show following the success of the television series Reply 1997 and a renewed interest in first-generation K-pop idol groups.
They released a digital single (a remake of NRG's "You Can Do It") and music video,[6][7] appeared together on Happy Together[8][9] and other variety shows and performed on Immortal Songs: Singing the Legend.
The show received considerable attention amongst long-time fans of the four groups and international netizens, especially after the episode of Immortal Songs: Singing the Legend which HOTSechgodRG participated in was broadcast and a subtitled version uploaded on YouTube by KBS World.
and Sechs Kies) collaborating for a television show was inconceivable back then due to the highly exclusive nature of the industry and such interactions had been discouraged.