Granqvist scored from the spot after a lengthy VAR review, with referee Joel Aguilar initially deciding Kim Min-woo had not fouled Viktor Claesson.
South Korea attempted to get back into the game but didn't have the cutting edge to find an equaliser, with Tottenham Hotspur star Son Heung-min left frustrated out wide.
"To be fair, every team in our group is better than us, so every game is going to be tough", the midfielder said as he looked ahead to Saturday's encounter in Rostov-on-Don.
Sweden and South Korean will take to the field tonight, 10PM our time.
Andersson's apology related to an incident at South Korea's pre-World Cup training camp in Austria, where a member of the Swedish coaching staff got into a closed Korean training session and was told to leave.More news: WHO classifies video game addiction as a mental health disorder
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After a Swedish spy was recently caught looking in on a closed South Korean training session, and even staked out at a property above their training facility to keep tabs on the latest tactics, the South Koreans clearly had to do something.
Hello! Welcome to the Live Updates of Sweden Vs South Korea.
Monday (local time). South Korea will take a return flight to St. Petersburg three hours after the final whistle.
A second-half penalty ...
It's no mean feat to replace Zlatan Ibrahimović, but Marcus Berg has thrived leading the line for his country since the departure of the charismatic striker from global football. The 31-year-old attacker is likely to start against South Korea and will be a threat from set-pieces.
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Shin Tae-yong puts his side through their paces at training.