(Prior to the establishment of the Gaon Chart in 2010, South Korea's music charts were supplied by the Music Industry Association of Korea (MIAK), which stopped compiling data in 2008. There are no known cumulative chart records for digital singles prior to 2010.)

The Best-selling Singles [Only Idols]

You and I by IU (2011) - 6.07 million
Through the Night by IU (2017) - 5.0 million
Good Day by IU (2010) - 4.78 million
Trouble Maker by Trouble Maker (2011) - 4.43 million
Roly-Poly by T-ara (2011) - 4.37 million
Nagging by IU&Lim Seulong (2010) - 4.13 million
Gangnam Style by Psy (2012) - 4.04 million
Fantastic Baby by Big Bang (2012) - 4.0 million
So Cool by Sistar (2011) - 3.94 million
Be My Baby by Wonder Girls (2011) - 3.92 million
Lovey-Dovey by T-ara (2012) - 3.76 million
Cry Cry by T-ara (2011) - 3.76 million
The Boys by Girls' Generation (2011) - 3.62 million
Good Bye Baby by Miss A (2011) - 3.6 million
Blue by Big Bang (2012) - 3.56 million
I Am the Best by 2NE1 (2011) - 3.47 million
Loving U by Sistar (2012) - 3.4 million
Alone by Sistar (2012) - 3.37 million
Can't Let You Go Even If I Die by 2AM (2010) - 3.35 million
Bad Girl Good Girl by Miss A (2010) - 3.33 million
Oh! by Girls' Generation (2010) - 3.32 million
Heaven by Ailee (2012) - 3.26 million
Every End of the Day by IU (2012) - 3.24 million
Ugly by 2NE1 (2011) - 3.24 million
On Rainy Days by Beast (2011) - 3.23 million
Fiction by Beast (2011) - 3.14 million
Friday by IU (2013) - 3.13 million
Hot Summer by f(x) (2011) - 3.05 million
I Go Crazy Because of You by T-ara (2010) - 3.04 million
Lonely by 2NE1 (2011) - 3.04 million
Starlight Moonlight by Secret (2011) - 3.02 million

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The Gaon chart provides rankings on a weekly, monthly, and yearly basis, which are based on an aggregate of downloads, streaming and background music. Most idol songs can be charted to the weekly charts thanks to the stream, but every song that succeeds in weekly charts is NOT able to enter monthly charts. Here are the top lists of monthly lists by years:
(The bold red ones indicate best-performing single of that year)

2010

January : "Can't Let You Go Even If I Die" by 2AM

February : "Oh!" by Girls' Generation
March : "Run Devil Run" by Girls' Generation
April : "Chitty Chitty Bang Bang" by Lee Hyori feat. Ceejay
May : "Time Please Stop" by Davichi
June : "Nagging" by IU feat. Seulong
July : "Bad Girl Good Girl" by miss A
August : "I Was Able to Eat Well" by Homme
September: "Go Away" by 2NE1
October : "Then Then Then" by Supreme Team feat. Young Jun
November : "Always" by Huh Gak
December : "Good Day" by IU

Best-selling single of 2010: "Can't Let You Go Even If I Die" by 2AM (3,353,000 sales)

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2011
January : "That Man" by Hyun Bin
February : "The Story Only I Didn't Know" by IU
March : "My Heart Beating" by K.Will
April : "Love Song" by Big Bang
May : "Lonely" by 2NE1
June : "Starlight Moonlight" by Secret
July : "Having an Affair" by Park Myung Soo&G-Dragon feat. Park Bom
August : "I Turned Off the TV..." by Leessang feat.Yoon Mi-rae&Kwon Jung-yeol
September: "Don't Say Goodbye" by Davichi
October : "Tokyo Girl" by Busker Busker
November : "Be My Baby" by Wonder Girls
December : "You and I" by IU

Best-selling single of 2011: "Roly-Poly" by T-ara (4,375,000 sales)

===

2012
January : "Lovey-Dovey" by T-ara
February : "Blue" by Big Bang
March : "Fantastic Baby" by Big Bang
April : "Cherry Blossom Ending" by Busker Busker
May : "Twinkle" by Girls' Generation-TTS
June : "Like This" by Wonder Girls
July : "I Love You" by 2NE1
August : "Gangnam Style" by PSY
September: "All For You" by Jung Eun-ji & Seo In-guk
October : "Bloom" by Gain
November : "1, 2, 3, 4" by Lee Hi
December : "Return" by Lee Seung Gi

Best-selling single of 2012: "Gangnam Style" by PSY (4,041,000 sales)

===

2013
January : "I Got a Boy" by Girls' Generation
February : "Gone Not Around Any Longer" by Sistar19
March : "Turtle" by Davichi
April : "Gentleman" by Psy
May : "What's Your Name?" by 4Minute
June : "Give It to Me" by Sistar
July : "BAAAM" by Dynamic Duo feat. Muzie of UV
August : "Story of Someone I Know" by San E
September: "Touch Love" by Yoon Mi Rae
October : "The Red Shoes" by IU
November : "Going To Try" by Jeong Hyeong-don & G-Dragon
December : "Loved You" by Seo In-guk & Zia

Best-selling single of 2013: "Shower of Tears" by Baechigi feat. Ailee (2,087,000 sales)

===

2014
January : "Something" by Girl's Day
February : "Some" by Soyou & Junggigo
March : "Come Back Home" by 2NE1
April : "200%" by Akdong Musician
May : "The Lone Duckling" by g.o.d.
June : "Eyes, Nose, Lips" by Taeyang
July : "A Midsummer Night's Sweetness" by San E, Raina
August : "Beautiful" by Park Boram feat. Zico
September: "Can't Go to Shinchon" by Postmen
October : "How I Am" by Kim Dong-ryool
November : "Miss Me Or Diss Me" by MC Mong feat. Jinsil of Mad Soul Child
December : "Luv" by A Pink

Best-selling single of 2014: "Some" by Soyou & Junggigo (2,868,000 sales)

===

2015
January : "Fire" by Mad Clown feat. Jinsil of Mad Soul Child
February : "You from the Same Time" by Naul of Brown Eyed Soul
March : "Love Mash" by MC Mong feat. Chancellor of The Channel
April : "Only You" by Miss A
May : "Loser" by Big Bang
June : "Bang Bang Bang" by Big Bang
July : "If You" by Big Bang
August : "Let's Not Fall In Love" by Big Bang
September: "Leon" by Park Myeong-soo & IU
October : "I" by Taeyeon feat. Verbal Jint
November : "Boys and Girls" by Zico feat. Babylon
December : "Daddy" by Psy feat. CL

Best-selling single of 2015: "Bang Bang Bang" by Big Bang (2,500,000+ sales)

===

2016
January : "Dream" bySuzy&Baekhyun
February : Rough" by GFriend
March : "This Love" by Davichi
April : "What the spring??" by 10cm
May : "Cheer Up" by Twice
June : "I Don't Love You" by Urban Zakapa
July : "Why So Lonely" by Wonder Girls
August : "Whistle" by BlackPink
September: "The Love I Committed" by Im Chang-jung
October : "Three Words" by SechsKies
November : "TT" by Twice
December : "Fxxk It" by Big Bang

Best-selling single of 2016: Rough" by GFriend (2,500,000+ sales)

===

2017
January : "I Will Go to You like the First Snow" by Ailee
February : "I Will Go to You like the First Snow" by Ailee
March : "Fine" by Taeyeon
April : "Can't Love You Anymore" by IU&Oh Hyuk
May : "I Luv It" by Psy
June : "Untitled, 2014" by G-Dragon
July : "You, Clouds, Rain" by Heize feat. Shin Yong-jae
August : "Ko Ko Bop" by EXO
September: "We Are" by Woo Won-jae feat. Loco&Gray
October : "Something Special" by SechsKies
November : "Gift" by MeloMance
December : "Emptiness in Memory" by Naul

Best-selling single of 2017: "I Will Go to You like the First Snow" by Ailee (2,500,000+ sales)

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2018
January : "Good Old Days" by Jang Deok Cheol
February : "Love Scenario" by iKON
March : "Starry Night" by Mamamoo
April : "Pass By" by Nilo
May : "Don't Give It to Me" by Loco&Hwasa
June : "Travel" by Bol4
July : "Ddu-Du Ddu-Du" by BlackPink
August : "Way Back Home" by Shaun
September: "Siren"by Sunmi
October : "Bbibbi" by IU
November : "Me After You" by Paul Kim
December : "Fiancé" by Mino of WINNER

Best-selling single of 2018: "Love Scenario"by iKON (2,500,000+ sales)

===

2019
January : "After You've Gone" by MC the Max
February : "Fire Up" by Woody
March : "Rooftop" by N.Flying
April : "Bom" by Bol4
May : "For Lovers Who Hesitate" by Jannabi
June : "2002" by Anne-Marie
July : "Drunk on Love" by Jang Hye-jin and Yoon Min-soo
August : "Remember Me" by Gummy
September: "So Long" by Paul Kim
October : "How Can I Love the Heartbreak, You're the One I Love" by AKMU
November : "Love Poem" by IU
December : -

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The current holders who has the most number one songs since 2010:
IU (22 songs)
Big Bang (10 songs)
2NE1, Sistar & Twice (9 songs)
Huh Gak, Girls' Generation &Davichi (8 songs)
Zion.T & Taeyeon (7 songs)

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