1. Who
Produced by Jon Bellion, Pete Nappi, Tenroc, Pdogg, GHSTLOOP
(Jon Bellion, Pete Nappi, Jason Cornet, Pdogg, GHSTLOOP)

Keyboard – Jon Bellion, Pete Nappi, Tenroc, Pdogg, GHSTLOOP
Synthesizer – Jon Bellion, Pete Nappi, Tenroc, Pdogg
Guitar – Tenroc, Pdogg
Bass – noogi park
Drum Programming – Jon Bellion, Pete Nappi, Tenroc
Background Vocals – Jon Bellion
Vocal Arrangement – Pdogg
Recording Engineers – Pdogg @ Dogg Bounce
John Arbuckle @ Cove City Sound Studios
Digital Editing – Pdogg, GHSTLOOP
Mix Engineer – Serban Ghenea @ MixStar Studios, Virginia Beach, VA (Assisted by Bryce Bordone)


2. Who (Instrumental)
Produced by Jon Bellion, Pete Nappi, Tenroc, Pdogg, GHSTLOOP
(Jon Bellion, Pete Nappi, Jason Cornet, Pdogg, GHSTLOOP)

Keyboard – Jon Bellion, Pete Nappi, Tenroc, Pdogg, GHSTLOOP
Synthesizer – Jon Bellion, Pete Nappi, Tenroc, Pdogg
Guitar – Tenroc, Pdogg
Bass – noogi park
Drum Programming – Jon Bellion, Pete Nappi, Tenroc
Recording Engineers – Pdogg @ Dogg Bounce
John Arbuckle @ Cove City Sound Studios
Digital Editing – Pdogg, GHSTLOOP
Mix Engineer – Serban Ghenea @ MixStar Studios, Virginia Beach, VA (Assisted by Bryce Bordone)


3. Who (Acoustic Remix)
Remixed by EVAN
Produced by Jon Bellion, Pete Nappi, Tenroc, Pdogg, GHSTLOOP
(Jon Bellion, Pete Nappi, Jason Cornet, Pdogg, GHSTLOOP)

Guitar – EVAN
Background Vocals – Jon Bellion
Vocal Arrangement – Pdogg
Recording Engineers – Pdogg @ Dogg Bounce
John Arbuckle @ Cove City Sound Studios
Digital Editing – Pdogg, GHSTLOOP
Mix Engineer – 전부연 @ HYBE Studio


4. Who (Rock Remix)
Remixed by EVAN
Produced by Jon Bellion, Pete Nappi, Tenroc, Pdogg, GHSTLOOP
(Jon Bellion, Pete Nappi, Jason Cornet, Pdogg, GHSTLOOP)

Guitar – YOUNG, EVAN
Bass – YOUNG
Drum Programming – EVAN
Background Vocals – Jon Bellion
Vocal Arrangement – Pdogg
Recording Engineers – Pdogg @ Dogg Bounce
John Arbuckle @ Cove City Sound Studios
Digital Editing – Pdogg, GHSTLOOP
Mix Engineer – Daniel Brecher


5. Who (Shibuyakei Remix)
Remixed by Pdogg
Produced by Jon Bellion, Pete Nappi, Tenroc, Pdogg, GHSTLOOP
(Jon Bellion, Pete Nappi, Jason Cornet, Pdogg, GHSTLOOP)

Keyboard – Pdogg
Synthesizer – Pdogg
Background Vocals – Jon Bellion
Vocal Arrangement – Pdogg
Recording Engineers – Pdogg @ Dogg Bounce
John Arbuckle @ Cove City Sound Studios
Digital Editing – Pdogg, GHSTLOOP
Mix Engineer – Yang Ga @ HYBE Studio


6. Who (Funky Remix)
Remixed by GHSTLOOP
Produced by Jon Bellion, Pete Nappi, Tenroc, Pdogg, GHSTLOOP
(Jon Bellion, Pete Nappi, Jason Cornet, Pdogg, GHSTLOOP)

Keyboard – GHSTLOOP
Synthesizer – GHSTLOOP
Drum Programming – GHSTLOOP
Background Vocals – Jon Bellion
Vocal Arrangement – Pdogg
Recording Engineers – Pdogg @ Dogg Bounce
John Arbuckle @ Cove City Sound Studios
Digital Editing – Pdogg, GHSTLOOP
Mix Engineer – 정우영 @ HYBE Studio


7. Who (Beautiful Mind Remix)
Remixed by Tenroc
Produced by Jon Bellion, Pete Nappi, Tenroc, Pdogg, GHSTLOOP
(Jon Bellion, Pete Nappi, Jason Cornet, Pdogg, GHSTLOOP)

Keyboard – Jon Bellion, Pete Nappi, Tenroc, Pdogg, GHSTLOOP
Synthesizer – Jon Bellion, Pete Nappi, Tenroc, Pdogg
Guitar – Tenroc, Pdogg
Bass – noogi park
Drum Programming – Jon Bellion, Pete Nappi, Tenroc
Background Vocals – Jon Bellion
Vocal Arrangement – Pdogg
Recording Engineers – Pdogg @ Dogg Bounce
John Arbuckle @ Cove City Sound Studios
Digital Editing – Pdogg, GHSTLOOP
Mix Engineer – Tenroc @ Beautiful Mind productions