What was the first kpop song that got you into kpop and made you check the other groups?

Monster

my first kpop song is Shinee's Lucifer in 2011 from there i started checking out more kpop groups

Twice TT

Obviously Nobody and Gangnam Style dont count

BigBang somebody to love

So Cool - SISTAR in 2011 while watching SBS PopAsia. It made me more interested in other girl groups that were around at the time.

First I heard was Blood Sweat & Tears. The one that got me into BTS was Butterfly, and after checking out BTS I kept getting recommendations from EXO in my spotify. I checked them out, then Red Velvet, and then I properly fell into K-pop after that.

BP - Boombayah

SHInee Lucifer. It was recommended to me by my friend. Then I began to check girl groups like SNSD and Apink.

I saw Hyuna's bubble pop in a web page ranking for best songs of the year

Lies by Big Bang got me into K-Pop but Irony by Wonder Girls made me check out other groups.