2015 - 10th Anniversary (+ Young Saeng's Return)

Relationship Cleanup - Collaboration - Solo - January 26, 2015

1. 관계정리 [Relationship Cleanup] - DanDi feat. Kim Kyu Jong

Still - Hyun Joong Japanese Album 2 - Solo - February 11, 2015

1. Tonight
2. Hot Sun
3. Gentleman (Japanese version)
4. Words that I Want to Tell
5. Still
6. Can't Erase Only You
7. Timing feat. Sky-Hi
8. Cappuccino
9. Beauty Beauty (Japanese version)
10. Nothing on You (Japanese version)
11. B.I.N.G.O
12. Good-Bye

Love Timing - Collaboration - Solo - April 17, 2015

1. Love Timing - Bobby Moon feat. Kim Kyu Jong & Seul-Gi

10th Anniversary-Memories - Jung Min SS501 Cover Album - May 1, 2015
Regular Edition:

1. End of the Shallow Dream
2. Really Like You [Hontoni Sukidatta]
3. U R Man
4. 4Chance
5. Let's Break Away
6. Love Like This
7. A Song Calling For You
8. Always and Forever
9. Until Forever
10. Only Me?

Limited Edition - Dance Version:

1. U R Man
2. 4Chance
3. Let's Break Away
4. Boundless
5. A Song Calling For You
6. Crazy 4 U
7. Love Like This

Limited Edition - Ballad Version:

1. End of the Shallow Dream
2. Really Like You
3. Gleaming Star
4. Always and Forever
5. Until Forever
6. Only Me?

Last Note - Jung Min (Romeo) Single (4 editions) - June 6, 2015

     I. 1. Last Breath (Japanese version) / 2. (instrumental)
     II. 1. No No No (Japanese version) / 2. (instrumental)
     III. 1. Last Breath (Korean version) / 2. (instrumental)
     IV. 1. No No No (Korean version) / 2. (instrumental)

It's Summer Time... - Jung Min Album - June 8, 2015
Regular Edition:

1. Going Going
2. Yes or No (Korean version)
3. Kiss
4. Bye Bye
5. Summer Blue
6. LUCKY DAYS
7. 弱虫(Coward)
8. 記憶のテープ [Memory Tape?] (Korean version)
9. 君を… [You...?]
10. 君を…（instrumental）
11. 記憶のテープ（instrumental）

Limited Edition - 10th Anniversary Version:

1. LUCKY DAYS
2. Kiss
3. Bye Bye
4. Summer Blue
5. 弱虫 (Coward)
6. Snow Prince
7. 弱虫 (Coward)（Instrumental）
8. Snow Prince（Instrumental）

Limited Edition - Going Going Version:

1. Going Going
2. Yes or No (K Ver)
3. 記憶のテープ [Memory Tape?] (K Ver)
4. 君を… [You...?]
5. Going Going (K Ver)
6. 君を…(K Ver)
7. Going Going （Instrumental）
8. Yes or No （Instrumental）

The Best of Kim Hyun Joong - Hyun Joong Compilation - Solo - July 1, 2015
Normal Edition:

1. ・KISS KISS [JAPANESE VERSION]
2. ・Lucky Guy [JAPANESE VERSION]
3. ・BREAK DOWN feat. Double K [JAPANESE VERSION]
4. ・U [JAPANESE VERSION]
5. ・HEAT
6. ・Let's Party [JAPANESE VERSION]
7. ・Save Today
8. ・I'm Yours
9. ・Your Story [JAPANESE VERSION]
10. ・僕は君のもの [JAPANESE VERSION]
11. ・TONIGHT
12. ・君だけを消せなくて
13. ・UNBREAKABLE FEAT. JAY PARK ★
14. ・HOT SUN
15. ・TIMING (feat. SKY-HI)
16. ・B.I.N.G.O
17. ・Good-Bye
18. ・今でも
19. ・伝えたい言葉 [JAPANESE VERSION]
20. ・Beauty Beauty [JAPANESE VERSION]
21. ・Nothing on You (feat. Han-Hae of Phantom) [JAPANESE VERSION]
22. ・Please ★
23. ・君も僕と同じならば ★
24. ・Cappuccino ☆
25. ・YES I WILL ★☆
26. ・SMILE ★☆
27. ・僕は君のもの ★☆
28. ・以前のように ★☆

Limited Edition A:
  24.・Gentleman [JAPANESE VERSION] ☆
  25. ・Marry Me [JAPANESE VERSION] ☆
  26. ・ほほえみのちから ☆
  27. ・YOUR STORY FEAT.DOK2 ★☆
  28. ・DO YOU LIKE THAT ★ ☆

Love is Drawn - Kyu Jong Japanese Single 1 - Solo - July 21, 2015

1. 愛を描く [Love is Drawn]
2. A. 君へ…～僕らのストーリー～ [To You...~Our Story~]
   B. Summer Love
   C. To You...~Our Story~
3. A. Love is Drawn (instrumental)
   B. Summer Love (instrumental)
   C. To You...~Our Story~ (instrumental)

Cross the Line - Hyung Jun (Digital) Single - August 17, 2015

1. Cross the Line - Kim Hyung Jun feat. Eluphant's Kebee

Run Away - Jung Min (Romeo) Japanese Mini-Album - December 12, 2015

1. Run Away
2. Run Away (Korean version)
3. Faith (Korean version)
4. In the Forest (Korean version)
5. Run Away (instrumental)

Faith - Jung Min (Romeo) Japanese Mini-Album - December 12, 2015

1. Faith
2. Faith (Korean version)
3. Run Away
4. Run Away (Korean version)
5. Faith (instrumental)

In the Forest - Jung Min (Romeo) Japanese Mini-Album - December 12 2015

1. In the Forest
2. In the Forest (Korean version)
3. Run Away
4. Run Away (Korean version)
5. In the Forest (instrumental)

Be With You - Hyung Jun Japanese Single - December 16, 2015

1. Be With You
2. Always and Forever
3. Time of Destiny
4. Be With You (instrumental)
5. Always and Forever (instrumental)
6. Time of Destiny (instrumental)

[Start Love OST] - Theme/Insert Song - Solo - [?]

1. [Start Love OST] - Kim Kyu Jong