Sandwiched between two crispy chicken filets, you'll find a hamburger beef patty, bacon, barbecue sauce, and a creamy black pepper sauce. It's like the turducken of hamburgers.
Available for a limited time only, the Double Down King goes for 6900 won (~$6.48 US) and is good for about 750 calories.
Seeing as South Korea is also the country where KFC offers a Double Down with a hash brown patty inside (they call it the "Max Double Down"), beef really was the next step.