If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
A strange disease appeared turns infected people into zombies. These zombies attack the people of Gangnam city. Psy with the assistant have mission protected the Gangnam city without zombies in 20 days and night
W/A/S/D - To move. Left Mouse Key - Click to fire. R - Reload. Spacebar - Swap weapon.