First song: HyunA - Bubble Pop!
First band: Girls' Generation
SNSD: GEE was my first song, and I fell into the kpop trap.
Dong Bang Shin Ki 
1st group: 2ne1
1st song: Falling in Love
for me it'd be bigbang and 2ne1's lollipop...love at first sight ;p
First group: BTS
First song: V & Jin - Its Definitely You
SHINee and SS501... because i was watching boys over flowers and their osts to that kdrama got me totally..
DBSK/TVXQ/THSK - Purple Line
Omg, that guy driving a car ????
ㅋㅋㅋ
omg... this was so long ago, but it's SHInee's Ring Ding Dong :D
I was never into Kpop, but my 1st was BTS - Dope, last year. Became a fan eversince :)
The first time I heard K-pop was in an Asian Pop Culture class my sophomore year of college in 2008. We had a unit on Rain (Bi) and we listened 'I'm Coming' It was the first time I had heard the Korean language and I really liked how it sounded~
SNSD - Run Devil Run, heard Mr Taxi on tv and decided to research them the next day and iirc I was obsessed with Run Devil Run in the beginning, now I like Genie the most as all time. Forever a sone since that day