Dice the tofu into 1cm cubes.
Drain the oil from the canned tuna using a strainer.
Finely chop the Cheongyang chili pepper and green onion.
Combine the tofu, tuna, chopped chili, and chopped green onion in a mixing bowl.
Add gochujang, doenjang, soy sauce, minced garlic, sesame oil, and sesame seeds, then mix well.
Heat a pan with some oil and stir-fry the mixed ingredients over low heat.
Transfer to a plate and serve.