Who is Sa'eed from Season of Migration to the North and what is their importance?

Mustafa is one of the men in the village, who arrived several years after the Narrator's departure. Since he is a stranger to the Narrator, he is very curious about the man. Mustafa believes the country needs educated people to aid in its advancement, and he doesn't view the Narrator's work as being in the right area. Mustafa had a business in Khartoum but decided he wanted to go into agriculture instead. An only child, he grew up in Khartoum without a father or any other relatives but his mother.