Album & Mini Album
# 1 Left Heart
- Released: March 6, 2007
- 사랑할 때마다 – Everytime We Love
- Day & Night (Feat. Baek Ji-Young)
- 왼쪽 가슴 – Left Heart
- 나 나쁘죠 (Feat. Kim Tae-Woo) – Aren’t I Bad
- 하리오 – Will Do
- 사랑은 좋은 거 (Feat. Common Ground) – Love Is Good
- 낡은 사랑 – Worn Love
- 버릇 – Habit
- You (Feat. Sweet Sorrow)
- 천일동안 – For 1000 Days
Mini Album Dropping the Tears
- Released: March 31, 2009
- The Present
- 1초에 한방울 (Feat. Dynamic Duo) – 1 Drop Per Second
- 눈물이 뚝뚝 – Dropping the Tears
- 소녀, 사랑을 만나다 (Feat. Tiffany) – Girl, Meets Love
- 쇼핑 – Shopping
- Love 119 (Feat. MC Mong)
- 눈물이 뚝뚝 (Inst.) – Dropping the Tears (Inst.)
- 소녀, 사랑을 만나다 (Inst.) – Girl, Meets Love (Inst.)
#2 Miss, Miss and Miss
- Released: November 5, 2009
- 바람 – Blow
- 그립고 그립고 그립다 – Miss, Miss and Miss
- 반복일 뿐이야 – Just a Repeat
- 최면 (Feat. Outsider) – Hypnosis
- 눈물연못 – Pond of Tears
- 사랑해 반대말 – Antonym of I Love You
- 끊었던 담배 – Once Quit Smoking
- 필름이 끊겼다 – The Film Stopped
- 이별 몰랐던 날 – The Day I Didn’t Know Farewell
- 초콜릿 (Project: Color Chocolate) – Chocolate
- My Last Love
- 사랑 후유증 – The After effects of Love
- 다시 사랑하면 안되니 – Can’t We Love Once Again?
- 사랑한단 말을 못해서 (소울 스페셜 OST) – They Can’t Love (Soul Special OST)
- 나무 – Tree
- 소원 (대왕세종 OST) – Wish (The Great King Sejong OST)
- 내 가슴이 운다 – My Heart Cries
- 그립고 그립고 그립다 (Inst.) – Miss, Miss and Miss (Inst.)
The Second Mini Album
- Released: March 10, 2011
- 분다 – Blow
- 입이 떨어지지 않아서 – Speechless
- 가슴이 뛴다 – Heartbeat
- 증상 – Symptoms
- 기가 차 Feat. 슈프림팀 & 씨스타 – Amazed (Feat. Supreme Team, Sistar)
- 선물 Feat. 은지원 – Present Feat. Eun Ji Won
- 입이 떨어지지 않아서 Inst. – Speechless Inst.
- 가슴이 뛴다 Inst. – Heartbeat Inst.
The Third Mini Album
- Released: February 14, 2012
- 부른다 – Calling You
- 니가 필요해 – I Need You
- 내가 싫다 – I Hate Myself
- 못된 생각 – Nothing Left
- will이라고 해 – I’m Will
- 내곁에 – I’ll Be with You
- 니가 필요해 (Inst.) – I Need You (Inst.)
#3 The Third Album Part 1
- Released: October 11, 2012
- 술래잡기 (Intro) – Closing My Eyes
- Butterfly
- 이러지마 제발 – Please Don’t
- 나가면 고생이야 (feat.BEENZINO) – Come to My Crib
- 환상속의 그대 (feat. 최자 of DYNAMIC DUO) – Hey You
- You are so beautiful
- Bluffing
#3 The Third Album Part 2
- Released: April 04, 2013
- 봄날의 기억 – Spring Memories
- 러브블러썸– Love Blossom
- Bon voyage feat.Beenzino
- Lay back
- Marry me
- 신호등 앞에서– Fade out
The Forth Mini Album
- Released: October 18, 2013
- Fall In Fall
- 촌스럽게 왜 이래 – You Don’t Know Love
- 니가 아닌 것 같아 – It’s Not You
- 첫 사랑은 죽었다 – First Love End
- Bubble
- 말실수 – A Slip Of The Tongue
The Fifth Mini Album
- Released: June 26, 2014
- 넌 너무 예뻐 – So Pretty
- 오늘부터 1일 – Day 1
- Sweet Girl (Feat. LE of EXID)
- 화창한 날에 – A Bright Day
- 사귀어볼래 – Love Love Love
- 끝번호 – Last Digit
Single
#1 Hario
- Released: June 6, 2007
- 하리오 (Sweet Mix) – Will Do
- 하리오 (Club Mix) – Will Do
#2 Love 119
- Released: December 2, 2008
- Love 119 (Feat. MC Mong)
- 나무 – Tree
- Love 119 (Inst.)
- 나무 (Inst.) – Tree (Inst.)
#3 1 Drop Per Second
- Released: June 4, 2009
- 1초에 한방울 A Mix (Feat. Dynamic Duo) – 1 Drop Per Second A Mix
#4 Present
- Released: March 10, 2010
- 선물 (Feat. Eun Ji Won) – Present
- 선물 (Inst.) – Present (Inst.)
#5 Amazed
- Released: January 21, 2011
- 기가 차 (Feat. Simon D of Supreme Team, Hyorin of Sistar) – Amazed
#6 I hate myself
- Released: January 31, 2012
- 내가 싫다 – I hate myself
#7 As Now (We Never Go Alone)
- Released: June 11, 2012
- 지금처럼 (We Never Go Alone) – As Now (We Never Go Alone)
- 지금처럼 (We Never Go Alone) (Inst.)
#8 Marry You (우리 결혼했어요 세계판 Part.5)
- Released: June 11, 2013
- Marry You
- Marry You (Inst.)
Original Soundtracks
A Love to Kill OST
- Released: November 11, 2005
- 꿈 – Dream
- 꿈 (Balld Ver.) – Dream (Ballad Ver.)
Syndrome OST
- Released: September 4, 2006
- 바보처럼 (Intro) – Like a Fool (Intro)
- 바보처럼 – Like a Fool
War of the Money OST
- Released: June 4, 2007
- 혼자 지는 달 (獨自月落) – Moon Setting Alone
The Great King Sejong OST
- Released: June 13, 2008
- 소원 – Wish
Boat OST (Japanese Movie)
- Released: June 4, 2009
- 1초에 한방울 A Mix (Feat. Dynamic Duo) – 1 Drop Per Second A Mix
Shining Inheritance OST
- Released: June 15, 2009
- 사랑은 벌이다 – Love is a Punishment
Soul Special: Music Drama OST
- Released: September 22, 2009
- 사랑한단 말을 못해서 – They Can’t Love
Wedding Dress OST
- Released: Jan 5, 2010
- 눈물연못 – Pond of Tears
Obstetrics and Gynecology Doctors OST
- Released: February 04, 2010
- 사랑까진 안돼요 – Not So Far as My Love
The President OST part.6
- Released: November 24, 2010
- 태양 – Sun
- 태양 (Inst.) – Sun (Inst.)
The Greatest Love OST Part.1
- Released: May 4, 2011
- 리얼러브송 – Real Love Song
- 리얼러브송 (Inst.) – Real Love Song (Inst.)
The King Two Hearts OST Part.2
- Released: April 11, 2012
- 사랑이 운다 – My Love is Crying
Arang and the Magistrate OST Part.7
- Released: September 26, 2012
- 사랑은 그대다 – You Are Love
Cheongdamdong Alice OST Part.4
- Released: December 22, 2012
- 사랑은 이렇게 – Love Like This
You Who Came From the Stars OST Part.2
- Released: January 08, 2014
- 별처럼 – Like a star
Collaborations
Lim Jeong-Hee – Vol.2 Thanks
- Released: March 22, 2006
- 운명 – Destiny
Uhm Jung-Hwa – Vol.9 Prestige
- Released: October 28, 2006
- Come 2 Me
Music Is My Life (Part 2)
- Released: May 7, 2007
- Music (Epik High, K.Will)
8Eight – Vol.1 The First
- Released: August 24, 2007
- 들어요 (Feat. K.Will, Lim Jeong-Hee) – Listen
Lim Jeong-Hee – Vol.3 Before I Go
- Released: October 4, 2007
- 들어요 (Feat. 8Eight, K.Will) – Listen
Hye Mi – Vol.1 Smoothy
- Released: October 10, 2007
- You’re My Everything (Feat. K.Will)
Suho – To. U (Single)
- Released: November 5, 2007
- 그냥 이렇게.. (Feat. K.Will) – Just Like This..
MBC Music Travel LaLaLa Live Vol.5
- Released: June 18, 2009
- 지금 이 순간 – This Is The Moment
- Over The Rainbow (K.Will, Shin Moon-Hee)
Project: Color Chocolate
- Released: August 25, 2009
- 초콜릿 (K.Will, Mario) – Chocolate
Mighty Mouth – Love Class (EP)
- Released: September 16, 2009
- Why (Feat. K.Will)
Taw – I Introduce My Girl Friend (Single)
- Released: November 25, 2009
- 내 여자 친구를 소개합니다 (Feat. Bae Soo-Youn, K.Will) – I Introduce My Girl friend
Snow Village (Single)
- Released: December 21, 2009
- 눈 내리는 마을 (After School, Ahn Young-Min, Brown Eyed Girls, Kan Mi-Youn, K.Will, Tei, Sook Hee) – Snow Village
E Sung – Yeo Chin Soo (Single)
- Released: April 28, 2010
- 여.친.소 (With Taw, Kim Hyung Jung) (Feat. K.Will) – Yeo Chin So
Blue Brand Vol.2 Trauma Part 1
- Released: May 12, 2010
- 아무 말도 하지마 (JP Kim Feat. K.Will) – Don’t Say Anything
After The Bus Left (Single)
- Released: May 13, 2010
- 버스가 떠난 뒤에 (Feat. Miryo – Brown Eyed Girls) – After The Bus Left
Navi – We Really Loved Each Other (Single)
- Released: June 21, 2010
- 나비 (NAVI) – 우리 정말 사랑했어요 (With K.Will) – We Really Loved Each Other
Gilme – Love Actually
- Released: July 29, 2010
- 길미 – 미안해 사랑해서 (With K.Will) – Sorry, I Loved You
Zia – Difference (Mini Album)
- Released: August 6, 2010
- 지아 – 사랑을 가르쳐 주세요 (Feat. 케이윌) – Please, Show Me Your Love
Road for Hope ‘선물’
- Released: November 5, 2010
- Road for Hope ‘선물’ – Various Artists ‘Gifts’
The Name – Barely Alive
- Released: June 28, 2011
- The Name – 겨우 살아 (feat. K.Will) – Barely Alive
Zia – Hope It is You
- Released: September 9, 2011
- 지아 – 그대이길 바래요 (With 케이윌) – Hope It is You
Starship Planet – Pink Romance
- Released: November 25, 2011
- K.Will, Boyfriend, Sistar – 핑크빛 로맨스 – Pink Romance
Starship Planet – White Love
- Released: November 29, 2012
- K.Will, Boyfriend, Sistar – 하얀 설레임 – White Love
K.Will & Chakun – Even if u play
- Released: January 22, 2013
- 케이윌, 차쿤 – 놀아도 – Even if u play
Pro C – Bad Memory (feat. K.Will)
- Released: November 28, 2013
- 나쁜기억(Feat. 케이윌) – Bad memory
Starship Planet – Snow Candy
- Released: December 13, 2013
- K.Will, Boyfriend, Sistar – 눈사탕 – Snow Candy
K.Will & Jeon Woo Sung (Noel) – Perfume (Double Sidekick Project Vol.04)
- Released: December 17, 2013
- 케이윌, 전우성 (노을) – 향수 – Perfume
K.Will & Mamamoo – Some Guys, Some Girls (feat. Wheesung)
- Released: February 11, 2014
- 케이윌 – 썸남썸녀(Feat. 휘성) – Some Guys, Some Girls (feat. Wheesung)
SHORRY – Snapback Girl (feat. K.Will)
- Released: August 14, 2014
- 스냅백 걸 (Feat. 케이윌) – Snapback Girl (feat. K.Will)
Yoon Do Hyun – Me These Days (feat. Tablo K.Will)
- Released: August 28, 2014
- 요즘 내 모습 (Feat. 타블로, 케이윌) – Me These Days (feat. Tablo, K.Will)