Well, it isn't a Got7 song. I tried listening a few times, but it's too distorted. My only guess would be to see who else performed on M countdown? that week. Maybe the song will sound familiar.

I dont know the song but it's a song either from their album orr maybe a japanese song they made. Orrrr, a song that was llaying at music bank.

I'm not really sure either, I searched Got7 lyrics and I don't find a match, but I think I can hear Mark's voice.
I really liked the song, it has a really nice beat!
Do you perhaps know the name of the song?

If it's somewhat around 7 minutes, I think it's not a GOT7 song :)