An unpopular incumbent president and a scandal-plagued opposition leader. Two former justice ministers, one a fallen star and the other a neophyte.

The South Korean electorate was voting Wednesday to pick 300 members of parliament and decide whether President Yoon Suk Yeol will be able to advance his socially conservative agenda.

Here's a look at the four politicians who are key figures — even though not all of them are personally on the ballot: