Combine the gochujang, soy sauce, brown sugar, rice wine, oil, honey, chili flakes, and garlic in a mixing bowl and then pour into a 2-gallon ziploc bag.
Add the sliced pork and marinate in the refrigerator overnight.
To Cook
Light one full charcoal chimney with briquettes.
Once the briquettes are gray, dump them into a 22-inch (56cm) kettle style BBQ on one half of the pit. Leave the other half as a cool zone.
Close the lid and wait for the pit to warm up.
Remove the pork from the ziploc bag and discard the marinade.
Start grilling the pork when the grill is medium-hot, where you can place your palm about 6 inches (15cm) above the hot coals for 2 seconds.
Cook the pork on the grill, ensuring you do not burn the pieces. When they are starting to brown, move them to the cooler side of your grates. Put the cooked meat in a saucepan or foil pan to keep warm while you cook the pork in batches.
To Serve
Garnish the pork with the chopped green onions and white sesame seeds.