Born Im Jaebeom and better known by his stage name Jay B, Def. is a member of septet K-Pop boy band GOT7 and subunits JJ Project and Jus2; he wrote and produced songs under the name “Defsoul” until he eventually switched to “Def.”

While he has written for all three groups, his solo tracks were released under the psuedonym “Def.” only on SoundCloud until his first official EP LOVE that was released in 2022.

He has written, composed and produced many tracks on GOT7’s albums and has penned many of their recent title tracks including “You Are,” “Look,” “Eclipse,” and “You Calling My Name.”

Jay B was also heavily involved in the writing and production of all of the songs on JJ Project’s sophomore release Verse 2 including his solo track “Fade Away. He was also involved in many of the songs on Jus2’s debut album FOCUS.

Jay B as Def. (previously known as DefSoul) is part of a crew called ØFFSHORE and participated on songs they released, for example double single Cut #1 with his crewmate JUNNY and Royal Dive.

In addition to his writing credits, Jay B has been featured on many tracks such as Primary’s “Hush” and Deepshower’s “Higher.”