Here is your top 35 kpop groups and how these legends all started. I have listed below their first ever MV as well as album release.
Please note, all debut dates are currently in *Korean Standard Times/Dates.
Super Junior → November 5, 2005
Album: Super Junior 05 (2005)
‘Twins (Knock Out)’ MV
BIG BANG → August 18, 2006
Album: BIGBANG/We Belong Together (2006)
“We Belong Together” MV
Wonder Girls → February 9, 2007 (2007-2017)
Album: The Wonder Years (2007)
“Irony” MV
Girls Generation (SNSD) → November 1, 2007
Album: Into the New World (2007)
“Into the New World” MV
SHINee → May 25, 2008
Album: EP, Replay (2008)
“Replay” MV
2NE1 → April 30, 2009 (2009-2016)
Album: EP, 2NE1 (2009)
“Fire” (space ver.) MV
4Minute → June 15, 2009 (2009-2016)
Album: Hot Issue (2009)
“Hot Issue” MV
Infinite → June 9, 2010
Album: EP, Come Back Again (2010)
“Come Back Again” MV (인피니트 ‘다시돌아와’ 안무ver. 뮤직비디오)
miss A → July 1, 2010 (2010-2017)
Album: Bad but Good (2010)
“Bad but Good” MV
Girl’s Day → July 9, 2010
Album: EP, Girl’s Day Party #1 (2010)
“Tilt My Head” MV
EXO → April 8, 2011

Album: Mama (2011)
“Mama” MV
Apink → April 19, 2011
Album: EP, Seven Springs of Apink (2011)
I don’t Know(몰라요)
B.A.P. → January 26, 2012
Album: EP, Warrior (2012)
“Warrior” MV
EXID → February 16, 2012
Album: Holla (2012)
“WHOZ THAT GIRL” MV
BtoB → March 21, 2012
Album: Complete (2012)
“Insane” MV
VIXX → May 23, 2012
Album: Super Hero (2012)
“Superhero” MV
AOA → August 9, 2012
Album: Angel’s Story (2012)
“ELVIS” MV
BTS → June 13, 2013

Album: 2 Cool 4 Skool (2013)
“No More Dream” MV
WINNER → August 6, 2013
Albums: 2014 S/S (2014)
“Empty” MV
GOT7 → January 1, 2014
Album: EP, Got It?
“Girls Girls Girls” MV
Mamamoo → June 19, 2014
Album: HELLO (2014)
“Mr. Ambiguous” MV
Red Velvet → August 1, 2014

Album: ‘행복(Happiness)’ (2014)
“Happiness” MV
MONSTA X → May 14, 2015
Album: Tresspass (2015)
“Tresspass” MV
GFriend → January, 16 2015
Album: EP, Season of Glass
“Glass Bread” MV
iKON → September 14, 2015
Album: Welcome Back (2015)
“My Type” MV
Seventeen → May 16, 2015
Album: We Make You (2015)
“Call Call Call” MV
TWICE → October 19, 2015

Album: The Story Begins
“Ooh Ahh” MV
NCT → April 4, 2016
Album: The 7th Sense (2016)
“The 7th Sense” MV
I.O.I. → May 4, 2016 (2016-2017)
Album: Chrysali (2016)
“Dream Girls” MV
BLACKPINK → August 8, 2016

Album: Square One (2016)
“BOOMBAYAH” MV
Pentagon → October 10, 2016
Album: Pentagon (2016)
“Gorilla” MV
Momoland → November 10, 2016
Album: EP, Welcome to Momoland
“JJan! Koong! Kwang!” (짠쿵쾅) MV
Wanna One → August 8, 2017
Album: 1X1=1 (To Be One) (2017)
“Energetic” MV
(G) I-dle → May 2, 2018

Album: I am (2018)
“LATATA” MV
Loona → August 7, 2018 *debuted as a group
Album: ++ (2018)
“favOriTe” MV
Thank you so much for reading! Comment down below your favorite Kpop debut song.