Combine yellow onion, white and light green parts of green onions, soy sauce, sugar, sesame seeds, garlic, sesame oil, red pepper flakes, ginger, and black pepper in a bowl until marinade is well mixed. Add steak slices to marinade; cover and refrigerate, 1 hour to 1 day.
Heat a skillet over medium heat. Working in batches, cook and stir steak and marinade together in the hot skillet, adding honey to caramelize the steak, until steak is cooked through, about 5 minutes. Garnish bulgogi with green parts of green onions.
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