The members of Good Day have finally reunited! As their friendship deepens, they begin collecting donations by auctioning off GD’s favorite items, but what are GD’s favorite items that have become the target of fierce competition? Meanwhile, Aespa, the 4th generation’s representative idol group, and GD, an icon of the 2nd generation, have teamed up! What kind of chemistry will they display as the No. 1 senior-junior duo in the music industry?