I said this many times over the years, KCon is not the same anymore, it's boring and there's not much to HEAR, and fans usually just want to see their faves, and don't care about anything else.
So, after Day 1, this is my TOP5.
1. Lee Youngji (the only one with 100% live singing, and her 1st Kcon too)
2. Baby Don't Cry (they weren't the most impressive, but I have to rate them higher than the 3rd one, because this was their 1st Kcon and they're rookies)
3. IVE (mostly live performance and great performance, also this song is really grew on me)
4. P1Harmony (they were the best boy group today with the most live parts)
5. IS:SUE (they were the most impressive girl group for me today!)
ZB1 and NOWZ also did good, btw, and sadly NCT127 didn't make the list either, because I'm done with SM not letting their Idols sing live. Doesn't matter how cool they are on stage, I only rate live singing.
You can argue with my ranking and tell yours, but don't argue with live singing, it's not a personal opinion, just pure facts, and yes, I watched everyone's full performances.