The box is exceeds the right boundary probably because of the `textwidth`. I would like to have it aligned. Besides, what is `\noindent` for? Why it seems to be the same with or without it.

```
\begin{enumerate}
\item The Young King tells the story of the illegitimate shepherd son of the recently dead king's daughter of an unnamed country. 
\noindent
\fbox{%
    \parbox{\textwidth}{%
The Young King tells the story of the illegitimate shepherd son of the recently dead king's daughter of an unnamed country. 
    }%
}
\end{enumerate} 

```

[![effect](https://i.stack.imgur.com/XJyLw.png)](https://i.stack.imgur.com/XJyLw.png)