SEVENTEEN has 13 members. Not 17, despite the name.
13 members + 3 units + 1 team = 17 (SEVENTEEN)

Honestly, I wasn’t really into K-pop.
But I kept hearing these songs and realized—wait, this is SEVENTEEN?
I just kept playing their music on repeat, and suddenly I got curious and started digging deeper.

I hope what I’ve gathered here will be helpful for you too.