It’s likely they didn’t know each other before being introduced by an established music industry executive, who chose them for their looks.
The look to be the new incarnation of Backstreet Boys, or N’Synch.
I doubt they can read music, write songs, or “really” play instruments.
It looks to be a business creation, a lot like 90% of the acts in Japan or Korea.
“Hey, Hey we’re the Monkees!”