Cut the tofu into cubes.
Drain the oil from the canned tuna and prepare.
Cut the kimchi into bite-sized pieces.
Heat cooking oil in a pan and stir-fry the kimchi.
Add the tuna and stir-fry together.
Add the tofu and gently stir-fry.
Season with soy sauce, sugar, and red pepper powder.
Place the stir-fried ingredients over rice.
Finish by sprinkling chopped green onion and sesame seeds.