Although the show initially had various co-hosts, Kim Sung-eun became the final permanent host alongside Shin and Tak.
The show has typically showcased older singers from the past who may or may not be still active in the entertainment industry, including Lee Seung-chul and Kim Heung-gook.
However they have also had episodes featuring more recent artists, including S.E.S., in recognition of their 10th anniversary since debut, as well as Sung Si-kyung just before he left for military service in July 2008.
Happy Sunday brought back Immortal Songs with the same hosts, Shin Jung-hwan, Tak Jae-hoon and Kim Sung-eun.
[2] Patti Kim was the first Korean artist to be invited and perform on Japan's NHK network as well as The Johnny Carson Show in Las Vegas, United States.