In a bowl, mix soy sauce, honey, sake, sesame oil, garlic, brown sugar, and gochujang until smooth.
Heat oil in a pan over medium-high heat and brown pork belly slices for 30 seconds per side. Remove and set aside.
In the same pan, pour in your sauce and simmer for 1 minute.
Add the pork belly back in and cook for 1 minute per side, allowing the sauce to thicken and coat.
Serve over a bowl of rice. Garnish with scallions and egg yolk if desired.