\documentclass[10pt]{xoblivoir}
\usepackage{tikz}
\usepackage{hyperref}
\newcounter{probno}
\setcounter{probno}{1}
\newenvironment{problem}[2]
              {%\stepcounter{probno}
  \vspace*{-0.5truecm}
               \begin{list}{}{\leftmargin 0mm} \labelwidth -1.5mm%itemize}
                  \item[{\raisebox{-.2\baselineskip}{\tikz\node[rectangle,fill=white,draw=none,inner sep=2pt]%
                  {\scalebox{1.3}{\!\!\!\! \theprobno}{~\footnotesize#1}};}}]
  $\empty$\tightlists

  #2}
              {\end{list}\vskip 1truecm}

\begin{document}
\begin{problem}{테스트}
testtesttesttesttesttesttesttesttesttest
\end{problem}
\end{document}

예제입니다.
부탁드립니다.