Drain oil from the canned tuna using a strainer.
Finely chop green onion, spicy green chili, and garlic.
In a bowl, combine tuna, chopped green onion, chopped green chili, chopped garlic, soybean paste, gochujang, sesame seeds, and sesame oil. Mix well.
Serve with perilla leaves or cucumber like a Korean dipping sauce (ssamjang).