You won't be able to kill any Korean soldiers from the inside of the control room, so you must go to your right. Eventually you'll end up standing on a metal balcony. Activate your cloaking device, move forward and eliminate two targets (screen).
Start running towards a machine gun post which is located in front of you. Use your cloaking device whenever possible. Obviously you must kill the gunner. Take cover behind the crate and wait for your nanosuit to regain power. Kill anyone who tries to use the cannon.
Wait for your armor to regain maximum power, activate camouflage and proceed towards a small platform (screen) which will lead you directly to the machine gun post. Notice that you must jump to get to that area. Approach the cannon and press the action key to use it.
Obviously you must use the machine gun post to kill all enemy soldiers (screen). Start off by eliminating the closest targets, because they pose a serious threat. Leave more distant targets for later. If you're lucky and skilled enough, you should be able to avoid sustaining major injuries.
Proceed to the right balcony (screen) once you've killed all Korean soldiers. You will come across some new weapons along the way. Keep moving forward and until you'll be able to turn right. Head on to the next room. This is where the mission will end. You'll also be rewarded with a new cut-scene.