Prepare the ingredients by mincing the garlic and a bit of scallion, chopping the squid, onion, cabbage, carrots, and scallions into strips. Chop jalapeño if you prefer it to be spicier. Prepare all the seasonings as well.
Heat up the pan, add a bit of oil, and saute the garlic and chopped scallions until fragrant.
Add the squid and saute them for a couple of minutes until it turns purplish-pink.
Add the vegetables and saute it all together for a couple of minutes.
Push the squid and vegetables to the side and season with gochujang, pepper flakes, pepper powder, soy sauce, sesame oil, sugar, sesame seeds, and plum juice on the side.
Mix the sauce with the rendered water from the squid and vegetables. Do this until it loosens up, then stir-fry the sauce with the squid and veggies.
Torch the squid for a couple of minutes while stir-frying. Be careful in handling this!
Finish with some sesame seeds, serve with rice, and enjoy!