Modern and contemporary Korean historical works can never get past the 5th Republic

We have all that great freedom of expression^^
but I seriously don't understand why they are stuck in the era of the 5th Republic;
Even though InWar is an overseas developer, they received praise for crafting a great story using North Korean themes (Modern Warfare 4)
I wonder how much longer Korean film and drama writers are going to keep recycling history from before the 5th Republic...