Justin Bieber -- Accused of Nightclub Attack ... Over Hip-Hop Request

Justin Bieber is being accused of taking a "cheap shot" at popular DJ Michael Woods' manager this week in South Korea -- but we're told that just ain't true ... not exactly, anyway.

Woods unloaded this morning on Twitter claiming Biebs "muscled" his way into the DJ booth Thursday night and requested he play hip hop music ... but when he told Justin to "f**k off and put some clothes on" Bieber attacked his manager.

However ... the party's host Ben Baller tells us Woods is blowing the whole thing WAY out of proportion -- and claims not one sucker punch was thrown.

Baller admits Biebs and Woods did have a heated exchange over the music -- but is adamant things were squashed before anything got physical.

For what it's worth ... Bieber got behind the turntables once Woods wrapped his set and played some hip hop.

Bieber gets what Bieber wants.