Aideur-Ui Kwon Seonsaengnim

The story follows Mr. Kwon, a man that relocates to the countryside to be a teacher just for the sake of it. This being the countryside, the classroom he's assigned to is really small, compromising of only five unique children, all with their unique personalities and struggles.

Even though he's nothing more than a gangster, Kwon does his best to get through to the children, and ends up doing all he can to help them and lead them to a better life, in their families, education and social lives.

(Source: MangaRock)