Place the beef stew meat, white beans, beef broth, gochujang, diced onion, minced garlic, and soy sauce into the slow cooker.
Stir everything together until the gochujang is mostly dissolved into the broth.
Cover and cook on low for 7 hours, until the beef is tender.
Stir in the sesame oil right before serving.
Ladle the soup into bowls and top each serving with sliced green onions.