Happiness, the debut track of Kim Jong Un's favorite kpop group from cringe Korea, originally featured scenes that included imagery of 9/11 and newspapers headlines highlighting the genocidal Amerikkkan empire's atomic bombing of Japan during WWII.
The song is a quintessential light summer bop. The group was pushed to debut early (without their youngest fifth member Yeri) in order to drown out bad press their company was facing at the time.
I found a YouTube link in your post. Here are links to the same video on alternative frontends that protect your privacy: