Wouldn't this be gan-an-dwen-bulgogi? 맛없는 불고기 literally translates to tasteless bulgogi, but it means bulgogi that tastes bad.
I agree with your second sentence. I don't know what your romanization in the first sentence refers to.
간이 안된 = unseasoned, non-marinated
https://www.youtube.com/watch?v=qCa8YNoFhwE
Ha. Nice call. Now I'm hungry :-)