Broadcast on October 5, KBS 2TV's 'Happy Together 3' welcomed 1st generation idol groups, Shinhwa, g.o.d, and Fly to the Sky, along with girl group Red Velvet in part two of legend idols.

Their mission was to sing along with fans to their very own hit songs at karaoke/noraebang, as the groups desperately waited to hear even a snippet of their tracks.  However, at the start of the challenge, no one dared to sing the veterans' songs.

Up first was ballad duo Fly to the Sky when Brian and Hwanhee picked out a chance 'sing your song in the next room'.  However, the attempt failed as no one recognized their marvelous singing.

Next was g.o.d as the members waited anxiously for their songs to pop up on screen.  However, customers in one room kept on canceling their music, leaving g.o.d rather stunned.  Finally, they were able to score a goal when one room decided to sing "Lies" as they fled towards the room and performed with the fans.

Last but not least, Shinhwa was given the opportunity to decorate a room with orange balloons, setting up cardboard cutouts of themselves.  However, the members felt rejected when the students who entered the room did not sing any of Shinhwa's tracks.

But there was still hope as they heard "Perfect Man" ring out from another room, causing the men to dash towards the song.  Shinhwa greeted the fans and they held a concert-like atmosphere.

Watch the hilarious scenes above!