The weekly mass demonstrations -- among the largest seen in South Korea since the pro-democracy protests of the 1980s -- have provided a stark challenge to Park's authority, but the president has defied calls to step down.
After claiming a turnout of around one million for last Saturday's protest, organisers said they expected around 500,000 people to march in Seoul, with a similar number demonstrating in other cities across the country.
"We want to have a peaceful protest as in the three previous rallies", Nam Jeong-Su, spokesman for the Korean Confederation of Trade Unions, told AFP.
Nam said he expected the ranks of protesters to be swelled by thousands of students who sat the national college entrance exam earlier in the week.
And this being South Korea -- with the world's highest smartphone penetration rate -- many had downloaded a special app showing a burning candle to hold aloft during the rally.
The anti-Park rallies have continued despite two televised apologies from the president over a scandal linked to her friendship with long-time confidante Choi Soon-Sil, who has been arrested for fraud and abuse of power.
Prosecutors are investigating allegations that Choi, 60, leveraged their friendship to coerce donations from large companies like Samsung to non-profit foundations which she set up and used for personal gain.
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