In a medium bowl, combine soy sauce, honey, brown sugar, minced garlic, ground ginger, black pepper, and red pepper flakes. Mix well to create a marinade.
Add the steak bites to the bowl and toss to coat evenly. Cover and marinate in the refrigerator for at least 30 minutes (up to 2 hours for more flavor).
Heat a large skillet over medium-high heat and add the olive oil.
Remove the steak from the marinade, reserving the marinade for later. Sear the steak bites in the hot skillet for about 3-4 minutes on each side until browned and cooked to your preferred doneness.
Lower the heat to medium, pour the reserved marinade over the steak bites, and let it boil for 2-3 minutes until it thickens into a sticky glaze, coating the steak.
Remove from heat and transfer steak bites to a serving platter.
Sprinkle with sliced green onions and sesame seeds for garnish.