Check out Hitmaker (https://mydramalist.com/26983-hitmaker-season-1) - it's only 4 episodes and it was really fun. Doni and Coni are trying to create their own idol group - the cast of Jackson and Sungjae were hysteric lmao.
If you want something calmer and maybe your faves are in this try an episode or two (it'S only 3 episodes) of It's Dangerous Beyond Blankets (https://mydramalist.com/25606-its-dangerous-beyond-the-blanket ) - It's just basically a few idols chilling around, doing nothing. but honestly - that's all I ever wanted to see :)
And if you dont mind Doni and Coni and their humour, check out some episodes of Weekly Idol (when they were the main MCs) or Idol Room with your favourite idols as guests. I always enjoy their shows
Also, there is this article https://mydramalist.com/article/the-hub-of-unrivalled-hilarity-knowing-bros-011013629 that recommends the best episodes of Knowing Bros