Add all of the marinade ingredients to a freezer bag and whisk to combine. Add steak and turn to coat. Cover and marinate 30 minutes at room temperature or refrigerate up to overnight (flank requires overnight).
When ready to cook, let beef sit at room temperature for 30 minutes. Heat some sesame oil over medium high heat in a large skillet.
Working in 4 batches, add meat (grabbing meat with tongs so excess marinade drips off) in a single layer and let sear 1-2 minutes. Flip and cook and addition 1-2 minutes or until browned but barely cooked through then add sesame seeds and stir to combine. Transfer to a plate and cover tightly with foil. Repeat.
Assemble Bowls: Add salad greens and rice to bowl. Top with beef, cucumbers and carrots, kimchi, etc.
Cucumber and Carrot Salad: Combine all cucumber and carrot salad ingredients in a bowl and toss to combine. Chill until ready to use.
Spicy Gochujang Sauce: Combine all Spicy Gochujang Sauce ingredients in a bowl.
In individual salad bowls: add mixed greens; then add a scoop of brown rice on the side of the greens; then add a scoop of the Cucumber and Carrot Salad onto the greens; then add the Crispy Baked Tofu; then drizzle salad and rice with some of the Cucumber and Carrot Salad sauce and some of the Korean Marinade Sauce; then top the dish with fried egg(s); and then drizzle the Spicy Gochujang Sauce on top.