Preheat your oven to 400 degrees F.
In a small bowl, whisk together the gochujang, minced garlic, lime juice, honey, sesame oil, soy sauce, rice wine vinegar, and red pepper flakes until smooth. Set aside.
Pat the salmon filets completely dry with a paper towel. Season generously on both sides with salt and pepper.
Heat the olive oil in a large cast iron skillet over high heat until shimmering.
Carefully place the salmon in the skillet, skin side down. Sear without moving for 3 minutes to brown the skin.
While the salmon is searing, brush the flesh side of the filets with the gochujang glaze, dividing it evenly.
Transfer the skillet directly to the preheated oven. Roast for 8-10 minutes, or until the salmon reaches your desired internal temperature (125°F for medium-rare, 135°F for medium).
Remove the skillet from the oven (remember, the handle is hot!). Let the salmon rest in the pan for 5 minutes.
Garnish with sesame seeds and sliced green onions. Serve warm over rice or with vegetables.