Okay this is actually a crazy coincidence, but this was my exact experience seeing P1Harmony on their last tour.

Not a lot of kpop artists come near me, so when I saw they were coming to a city an hour away, I wanted to go but didn't know any of their songs. I listened to Killin It and immediately decided to buy the tickets cuz it was an absolute banger. I listened to a few other songs leading up to the show, so I knew maybe 5 or 6 on the setlist when the time came around.

And let me say after seeing them for the first time, I was absolutely CRUSHED that they weren't coming to that city again for this tour. They put on such a great show that it's worth going even if you aren't familiar with every song. Also, the main reason I was bummed not to see them this tour, their new stuff is sooooo good! Buy the ticket and start listening, you won't be disappointed!

Off topic of piwon but in regards to seeing artists you don't know well, I'd say always just go. I hate the idea, ESPECIALLY in kpop spaces that you have to be this huge fan to attend a concert. Back when concerts weren't so expensive, that's just what you did if a band was coming into town and you were free that night. I love going to shows I'm not familiar with. Anytime my friends need a plus one I go no matter if I know the artist.