Here is an overview of the game, via Nexon Korea:
Project Magnum is a PC and console-based game that combines RPG play with third-person shooter combat. It presents beautiful visuals and attractive and unique characters based in a science-fiction style player-versus-environment worldview.
It also provides exciting battles using various skills, actions, and guns, as well as the fun of high-quality player-versus-environment shooter battles that target huge bosses.
Project Magnum will be available in most major markets worldwide. More information on the release schedule of Project Magnum will be announced at a later date.