Here is my top favorite "Hello" (not necessarily about saying hi but introducing underrated kpop idols/groups) KPop Songs I hope you enjoy them :)
1. B.I.G.(Boys In Groove)- Hello (their debut song) If you haven't heard of them you should check them out.
2. M. Crown (not to get confused with M. Clown) - They are fairly new so hopefully they will get more support and love
3.Boys Republic- Hello
4.Nuest- Hello (do you see a pattern it's not all going to be called hello it just happened like that)
5. A-Jax - Hot Game (they are so underrated they need more love)
6.AlphaBAT- AB City (they need more love if you haven't heard of them check them out)