Copy and pasting my previous reply about Alien Stage to someone else because I am not typing all that out again
Alien Stage is a Korean music project by VIVINOS, it's about aliens keeping humans as pets and making them compete in the singing competition Alien Stage as entertainment, there are ten music videos in the official playlist, 6 of which are of the rounds, the rest are extras or in the case of All-In, a music video to show what happened between two rounds, you can find the Alien Stage playlist here: https://www.youtube.com/playlist?list=PLQ-JZOYFII4dHqeSu6yeGj-30sZohX_oX