Cut the squid, shrimp, tofu, and green onion into bite-sized pieces.
Heat cooking oil in a pan and stir-fry minced garlic and green onions until fragrant.
Add the squid and shrimp and stir-fry.
Add the tofu and sauté gently over low heat.
Season with gochujang, doubanjiang, soy sauce, and chili powder.
Pour in water or broth and bring to a boil.
Add starch water to adjust the thickness.
Finish with sesame oil and pepper.