This photo is of some Korean Special Forces. It looks like they are using HK MP5SDs however if you look more closely the front sight is wrong. In fact this is a Daewoo Telecom K7.

It is an interesting mutation of an AR style receiver but right away you start to see major differences. The magwell area looks like a Colt SMG but as you move rearward, the the area where the grip interfaces looks very different. The collapsing stock is somewhat similar to an HK MP5 but it looks like it indexes on the rear take down pin. Then there is the upper receiver with integrated rear sight.