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It's the final day of the group stage at the 2022 World Cup but the anxiety levels of these two sides are at opposite ends of the scale.
After wins against Ghana and Uruguay, Portugal top the group standings on six points and are out to make it three out of three.
They'd secure top spot with a draw or a win — and that might come with a perk: avoiding Brazil in the last 16.
South Korea still have a slim chance of qualifying — but they need to take care of business themselves and hope for in the other game taking place concurrently, between Ghana and Uruguay, if they are to advance.
We'll run through all the permutations shortly but a win for Ghana would mean the South Koreans cannot qualify whatever their result at Education City Stadium.
In an intriguing sub-plot, it could prove to be the final game in charge of South Korea for Paulo Bento, a Portuguese coach who says he will sing the national anthem of his native country before the match starts.
"I was born a Portuguese and I'll die a Portuguese," he said. "I'm proud to be from Portugal."
In a twist of fate, the last of Bento's 35 games as a player for Portugal came against South Korea in their third and final group game at the 2002 World Cup. South Korea won 1-0 to advance and eventually reached the semi-finals.
Bento went on to coach Portugal from 2010-14, leading the team at the European Championship in 2012 and the World Cup in 2014.
Plenty to look out for then, and plenty to play for. Stick with us throughout the day...