The country's rival political parties are engaged in one final push to win the hearts of undecided voters on this Tuesday, the last day of the 13-day campaigning period.
These elections are increasingly being seen as a vote of confidence for the Park Geun-hye administration with last month's tragic ferry disaster hitting the incumbent government hard.
The ruling Saenuri Party is calling on the public to give them one more chance to revamp and reform the government in the wake of the disaster.
"I earnestly plead with voters to give us strength and another chance so President Park can make a new Korea. Our party, by helping the president, will build a new Korea."
The main opposition New Politics Alliance for Democracy is calling on voters to hold the ruling party responsible for the government's poor handling of the tragedy.
"The Saenuri Party is already asking us to forget about the Sewol-ho ferry. They ask voters to forget about it, and wipe the tears of the president by helping her. We'll never forget the Sewol-ho ferry disaster."
Over 13-thousand polling stations around the nation will open at 6am on Wednesday and close at 6pm.
More than 11 percent of eligible voters already cast their ballots in early voting held late last week.
Park Ji-won, Arirang News.