k.will's tittle song of mini album and original soundtrack

1st : Hario

• Released: June 6, 2007
• Language: Korean  

Tracklisting :

1. 하리오 (Sweet Mix) - Will Do
2. 하리오 (Club Mix) - Will Do

 2nd: Love 119

• Released: December 2, 2008
• Language: Korean

Tracklisting :

1. Love 119 (Feat. MC Mong)
2. 나무 - Tree
3. Love 119 (Inst.)
4. 나무 (Inst.) - Tree (Inst.)

3rd : 1 Drop Per Second

• Released: June 4, 2009
• Language: Korean

Tracklisting :

1. 1초에 한방울 A Mix (Feat. Dynamic Duo) - 1 Drop Per Second A Mix

 4th : Present

• Released: March 10, 2010
• Language: Korean

Tracklisting :

1. 선물 (Feat. Eun Ji Won) - Present
2. 선물 (Inst.) - Present (Inst.)

5th :Amazed

• Released: January 21, 2011
• Language: Korean

Tracklisting :

1. 기가 차 (Feat. Supreme Team & Sistar) - Amazed

6th : I hate myself

• Released: January 31, 2012
• Language: Korean

Tracklisting :

1. 내가 싫다 - I hate myself
2. 내가 싫다 (Inst.) - I hate myself (Inst.)