"Handsome Boys of the 20th Century" was created by Moon Hee-joon who invited five celebrities, all of whom were born in the same year (1978), from three other first generation idol groups to start a reality show version of the TV series "Reply 1997". He presented the idea that they would meet up casually to chat and reflect on topics from their past which they were not allowed to touch on back then. The show starred Moon Hee-joon and Tony An, Chun Myung-hoon, Eun Ji-won, and Danny Ahn. The five members named themselves HotSechgodRG — a portmanteau of each member's previous idol group names.