There are 10 tracks all combined with the title track N.O. I've heard all of the songs above and for me it’s all great!
Basically this 1:11 minute length song is Rap Monster’s part. At first he give some kind of narration and it’s in english so dont worry haha. And after a few seconds of narrations it continues with rap which the meaning of it is actually telling about the ‘importance’ of living your life to the fullest.
This is the title track of this mini album. This song telling about the hardship of students who feels their life frustrating because of the pressure from adults (this is my way to interpret this song). Plus the music video already tells it all. In the MV, in the first minute they're all act to be a soul-less students in a some kind of 'isolated' and they're controlled by a mastermind (I don't know how to describe this person, it’s the one with red thingy on his head hehe).
I have 2 favorite songs in this mini album and one of them is “We On.” This song tells about how BTS’s members feels about those who ignore and scold them at first but then try to get noticed by the members after their debut in the KPOP Industry (we can call these people hypocrites). Well, they also express their feelings toward their haters here and I just love it! To those who have the same feeling, you should check out this track, I’m telling you it’s catchy.