What does Dickens want us to understand about the "business" of being human?

Dickens shows readers that he believes the “business” of being human is to care for and build meaningful relationships with others.

the answer is: round.

in literature, round characters are considerably complex and experience or are subjected to unpleasant situations. as a consequence, they go through crucial sentimental and psychological development, which can cause surprise in the readers. in this case, juan's dramatic transformation is related to the adversities he meets at school.