2017 - A Dozen Years of Double S (+ Hyun Joong and Jung Min's Return)

Toxic Love - Jung Min (Romeo) Japanese Single - January 11, 2017

1. Toxic Love (Japanese version)
2. Toxic Love (Korean version)
3. Toxic Love (instrumental version)

White Hole - Hyun Joong Single - January 23, 2017

1. White Hole

AM to PM 5-11-3 - Hyung Jun 3rd Mini Album - March 2017

1. PM 11. 2MORO
2. AM 3. Woo Yeah
3. PM 5. Count On You
4. [only on repackaged album AM to PM 7-5-11-3] 7 O'CLOCK

Fan Selection Best - Jung Min (Romeo) Compilation Album - April 3, 2017

1. ナップンニガヨ [Only Me?]
2. 愛するチカラ [The Power of Love]
3. Save Us Tonight
4. 浅い夢の果て [The End of the Shallow Dream]
5. ふたり [Two People]
6. Number One
7. Kiss
8. 千年経っても（K Ver.）[Even After A Thousand Years]
9. あなた以外誰も抱きしめない [Want to Hug No One But You]
10. Always and Forever
11. 愛をください [Please Give Me Love]
12. Love Like This
13. 千年経っても [Even After A Thousand Years]

One Step OST - Theme/Insert Song - Solo - April 18, 2017

1. 무지개 [Rainbow] - Kim Kyu Jong

Play in Nature Part.1 SPRING - Kyu Jong 1st Single Album - May 10, 2017

1. 안녕, 봄 [Hi, Spring]

UNISON VOL 1 - Double S 301 (12th Anniversary) Special Album - Sub-Unit - June 8, 2017

1. Hello Mello (title song)
2. Summer Love
3. Long Night
4. Hello Mello (instrumental)

The Emperor: Owner of the Mask OST - Theme/Insert Song - Solo - July 13, 2017

1. 바라보기 [Looking] - Heo Young Saeng

Play in Nature Part.2 FOREST - Kyu Jong 2nd Single Album - October 2, 2017

1. Hug Me (Korean version)
2. Hug Me (Japanese version)