Finely chop the onion and slice the green and red chilies.

Drain the oil from the canned tuna and heat it in a pan over medium heat.

Add chopped green onions to the pan and sauté until fragrant.

Add the chopped onion and cook until translucent.

Mix the seasoning ingredients: water, doenjang, gochujang, red chili powder, sugar, minced garlic, and sesame oil. Add the mixture to the pan.

Add the tuna and sliced chilies to the pan and mix well.