Can anyone tell me who they are?

And the song?

So I was watching kpop tiktoks (don't judge) and I came across this concert things it looks like, it's a 4 member boy groups and they songs is good from what I can tell, can anyone tell me who it is and the name?

It starts at 6:51

Quote from Sweet-Spice

ain't that a sub unit stage for a Seventeen concert

I could be wrong

Quote from bangtan-chan

i used tiktok by searching up the tiktokers name then started looking for the same tiktok lol

Quote from sanamana

this is seventeen's performance unit!!

Song is 'swimming fool'

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Thanks so much! I was so lost, I looked up 4 membered by groups in kpop then looked up parts of the lyrics under the group names..... I searched like 10 groups with like 5 lyrics and go tno where.... no wonder it didn't give me results......

Quote from SooYoung

i think it's a sub unit performance from some seventeen members

Quote from bangtan-chan

swimming fool i think

Quote from dontwannacry04

💎 Slip into the Diamond life 💎

I don't think I have room for so many more people and I don't want to fall in love with another guy......

And they are so young.......ahhhhh