Combine the potato starch, flour, salt, black pepper, and water in a bowl and mix into a batter.
Add the cubed chicken thighs and coat in the batter thoroughly.
Heat a pot of oil to 375°F. Drop the chicken in and cook until golden brown and crispy, then remove from the heat and set aside to drain.
For the sauce, combine the gochujang, light soy sauce, honey, rice vinegar, water, and garlic in a pan and bring everything to a simmer.
Add the fried chicken and toss until well coated.
Serve over a fresh bowl of rice. Optionally garnish with sesame seeds and scallions. But it's your food, you eat it how you like.