In the context of the story or material you are referring to, Nol Bu's feelings towards his brother, often depicted in various folk tales or narratives, can vary. Typically, Nol Bu is portrayed as envious or resentful of his brother, who is often depicted as kind, hardworking, or successful. This jealousy drives many of the story's conflicts.
If you can provide more specific context or details, I could give a better answer!