These two countries played earlier in the Nations League when Portugal won 4-0 in their home, while Switzerland prevailed 1-0 in the reverse leg.
The South Korean team erupted with joy when they learned they had qualified, as it was their first appearance in the last 16 since 2010.
Kim Young-gwon and Hwang Hee-chan scored one goal each at the Education City Stadium to see their team through to the knockout stages.
South Korea will play Portugal in a Group H fixture of the Qatar World Cup on Friday.
South Korea will take on Portugal in a Group H fixture at Education City Stadium, aiming to book a spot in the last-16 stage of the Qatar World Cup.
South Korea started the World Cup on a positive note with a well-earned draw against Uruguay. However, they suffered a 3-2 defeat in the next match to Ghana.
Despite the few shocks, one thing has remained constant - the big guns maintaining their dominance at this World Cup.
On Monday night, Portugal defeated Uruguay 2-0 at the Lusail Iconic Stadium in Qatar, moving to a six-point lead in Group H.
The Portuguese superstar criticised the club and stated that he had "no respect" for manager Erik ten Hag in an explosive interview with Piers Morgan.
Portugal will be looking to seal their passage into the knockout stages of the 2022 FIFA World Cup when they take on Uruguay in a Group H fixture at the Lusail Stadium on Monday n...