Iveglow
going for STAYC and ITZY here because those most fit my ears best 
but in same time I'm sure aespa was the one with biggest impact on kpop scene, the second one measured by that probably is K/DA
also no matter how we look at it
Everglow is clearly a dark horse, by terms of music and MV quality that's big 3 level
And they served up some real good B-sides in those albums
I voted K/DA because they are so good 
Hann is such, such a good song. That wordplay, the rhyming scheme is legitimately off the wall good. Simple but effective melody that haunts the backline of the song. The inspiration and the callbacks to a well known Korean Poem.
Still Soyeon's best song, what a masterpiece.
Latata was my cup of tea but I can recognise it's strengths, Latata/Hann is a one-two combo of excellent musical establishment and top tier songwriting from a debut idol.
Display MoreWhich one of these is your favorite debut and comeback (both songs)?
FYI, I did not add groups who either have only one song (no comeback/second single) or have disbanded.
I will say that Loona has one of the best debut songs
Butterfly is loved internationally, but domestically their best comeback is PTT
LOL at K/DA being included.
I went with (G)I-DLE and Everglow. There are other songs I like from the others, but I still listen to (G)I-DLE and Everglow quite a lot. Hopkinz kind of made me think of that recently with their thread, asking what was an actual bop for you... It's one thing to like a song or even replay it for a while, and it's another thing for it to have months or years of staying power.
HANN itself is a masterpiece and the best song among all of them. 
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