Ban Ki-moon

Who's next? A look at South Korean presidential contenders

Fresh off impeachment, South Korean President Park Geun-hye's days in office may be numbered.

Her potential successors include the outgoing secretary general of the United Nations, an ambitious mayor who has been compared to both Donald Trump and Bernie Sanders, and the man who conceded the presidential race to Park four years ago.

Park was suspended as president following a parliamentary impeachment vote Friday. She will be formally removed from office if six of the Constitutional Court's nine justices support her impeachment in a review that could take up to six months.

The chances of the court reinstating Park are considered low, and if she's unseated, the...