Groups By: Debut Year '00s

inactive / disband produce 101 The unit mixnine kpop star & superstark sixteen idol school boys24 Unpretty rapstar

keY

[If highlighted in a color, as stated previously: that means at least one member was a part of whatever the color means.]
[Not everything is completely updated w colors.]
i'll bold the still active ones
This is coded as follows:
group - company - debut song - disband?

2000

CB Mass - Daeyoung AV (CJ E&M) - Massmediah - disband: 2003
Papaya 파파야 - One Star Music, Cream - Fairy Tale 동화 - 2001 || Oh My Girl remade their song
5tion (pronounced Ocean) 오션 - JT Corea - Feel - still active

2001

Jewelry - Star Empire - Discovery - 2015 [longest running girl group]
KISS (Korea International Super Star) - J-Entercom - Because I'm a Girl 여자 이나까 - 2002, reunited in 2016
M.I.L.K - BM (SM's sister label) - Come To Me - 2003
jtL - Yejeon Media - 2003 [former members of H.O.T]
Epik High - Woollim (2003-2008), Map the Soul ('09-'10), YG ('10-present) - Map of the Human Soul / "GO" - still active

2002

Sugar 슈가 - Starworld, Bertelsmann Music Group, SM - Sweet Love - 2006
Black Beat - SM - In the Sky - 2007
Shinvi 신비 - Cid.K (subsidary of SM) - To My Friend - 2003 (they disappeared basically)
Leessang 리쌍 - Jungle, Leessang Company - Rush - 2017, reports after they started their own labels
Luv (Love yoUr Voice) - SidusHQ - Orange Girl - 2003
Isak N Jiyeon 이삭 N 지연 - SM - 2004 (were from The Grace)
Moon Child (AKA) M.C the Max - Music&NEW, 325 E&C - Delete - still active
Noel 노을 - YNB - Despite Holding On - still active

2003

Big Mama - Taillrunsmedia, M Boat (YG sister company, former) - Break Away - 2012
Dynamic Duo - Amoeba Culture - Taxi Driver - (former CB Mass members) - still active
Brown Eyed Soul - Santa Music - 정만 사랑했을까 I Really Loved You - still active
Buzz - Santa Music - Monologue - 2003-2006, 2014-present [Min Kyunghoon of Knowing Brother's group]
TVXQ / DBSK 동방신기 - SM - Hug - still active

2004

SG Wannabe - Mnet Media (04-09), IS Entermedia Group (09-11), CJ E&M (15-present) - Timeless - still active
V.O.S (Voice of Soul) - Star Empire, Happy Face (2015-present) - The Real - still active
TRAX (Typhoon-Rose-Attack-Xmas) - SM - Paradox - still active

2005

SS501 (Double S 501) - DSP (05-10), CI (16-present) - Never Again - still active
LPG (Lovely Pretty Girls) - Chan2 Productions, Aquagro - 캉캉 Can Can - still active
The Grace / CSJH The Grace (천상지희 더 그레이스) - SM - My Everything - 2011
Gavy NJ - Goodberry (05-08), Vitamin (08-10), Good Fellas (10-present), KW (present) - The Very First, But I'll Live - still active
Super Junior - SM - Twins (Knock Out) - still active, duh
Paran - NH Media (now NH emg) - First Love - 2011

2006

SeeYa 씨야 - Mnet (06-09), CCM (09-11) - A Woman's Scent - 2011
The Brown Eyed Girls / B.E.G (브아걸) - Nega Network (past), Mystic (present) - Come Closer 다라와서 - still active
2NB - Friday (06-12), Donuts Culture - The First Fragrance - 06-12, 16-presently active
Untouchable - TS - Ready To Shot - still active
Big Bang - YG - Bigbang - still active, obvi
Super Junior-K.R.Y - SM - The One I Love - 2016 hiatus
DickPunks - TNC Company, Sony Music - still active

2007

Wonder Girls - JYP, DefStar, Jonas, Studio J - Irony - 2017
KARA 카라 - DSP - Break It - 2016
F.T. Island (Five Treasure Island) - FNC - Love Sick - still active
Girl's Generation / 소녀시대 / 소시 (Sonyuh Shidae, SoShi) - SM - Into the New World - still active, bby
8eight (에이트, pronounced eight) - Big Hit, Source - Forget About Love and Sing - 2014
Sunny Hill 써니힐 - For Everyone media, Nega Network, Fave (current, under LOEN) - Love Letter - still active, hiatus
Supernova 초신성 - Mnet Media, CCM (07-12), Maroo (07-present) - HIT - still active
Tritops (Tree Tops) - Van Leader (current) - Boorish Love - still active
Super Junior-T (trot) - SM - Don't Go Away - active in '07, '08, and '15 only.
Baby Vox Re.V (Renaissance Voices) - DR Music - Shee - 2009 [was formed of Baby V.O.X]

2008

Davichi 다비치 - CCM, MMO, B2M, Stone Music - I Hate You, I Love You - still active
Mighty Mouth - YMC, 101, Allmighty Records (current) - I Love You - still active
Miss $ - Brand New Stardom, Brand New Music - Don't Cheat - still active
SHINee - SM - Replay 누나 너무 예뻐 - still active [RIP Jonghyun]
Super Junior-M (for Mandarin) - SM - U - 2014 (hiatus)
Super Junior-H (Happy) - SM - Cooking? Cooking! - 2008
2AM - JYP (08-10), Big Hit (10-14), JYP (14-17) - This Song - 2014 hiatus
2PM - JYP - 10 Points Out of 10 Points 10점 만전에 10점 - still active
U-KISS - NH Media (NH emg) - Not Young - still active
김창완밴드 Kim Changwan Band - LOEN - Darn It

2009

2NE1 (To Anyone, Twenty one) - YG - Fire - 2016
4minute- Cube - Hot Issue - 2016
After School - Pledis - AH! - still active, hiatus
Highlight (fmr BEAST, B2ST) - Cube, Around US (current) - Bad Girl - still active
f(x) - SM - LA chA TA - still active
JQT - GP - BLING BLING - 2012
MBLAQ - J. Tune Camp - Oh Yeah! - still active, hiatus (apparently)
Rainbow - DSP - Gossip Girl - 2016
Secret - TS - I Want You Back - still active
SHU-I (Super Tribe) - Bomb Bomb - 2015 - mainly active in Japan
T-ARA (Tiara) - MBK (fmr CCM) - Lies 거짓말 - 2018
December - CS Happy - True Love - still active
AshGray - Bigfoot Records - I love you...Remember - still active