WEBZEN,&nbsp;a global developer and publisher of PC and mobile games, announced that its mobile MMORPG 'MU Archangel'&nbsp;released its latest content update that includes the new Barrier System.. MU Archangel<b>&nbsp;</b>is<b>&nbsp;</b>a mobile spin-off of the popular PC MMORPG 'MU Online', which brings elements from the MU universe to mobile devices. MU Archangel is currently available in Southeast Asia for Android and iOS.. The latest update introduces a new defense system called 'Barrier'. T