"I think definitely", Andersson said, "the goalie was their best". "We got the penalty, we scored, and then it was just a fight to the end".
Sweden had not won an opening game at any World Cup since 1958, when they were runners-up in their best performance to date. Meanwhile, goalkeeper Robin Olsen was named in the line-up after recovering from a shoulder injury that had threatened his World Cup participation.
Players have been seen wearing different numbers during preparations for the finals in Russian Federation and Shin says it was a deliberate ploy to confuse any Sweden scouts ahead of the match.
"It was unfortunate we lost", he lamented, saying he was now focussed on the next game against "formidable" Mexico, who stunned world champions Germany 1-0 in the other Group F opener.
Although their most important match is just one day away, Shin said he just feels numb going to South Korea's first match.
The win was reward for Sweden's more attacking approach but it was unsurprising the victor came from the penalty spot in a game between two sides who had struggled for goals in the run-up to the tournament.
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Shin fielded Jo, the team's third-choice goalkeeper, because he is the tallest of the three keepers and the Koreans wanted to use his height against the Swedes.
Shin also started with Kim Shin-wook as his primary striker.
The Taeguk Warriors' only other chance fell the way of Hwang Hee-chan, who planted a header over the crossbar from a promising position late on.
Despite their increasing dominance, Sweden also demonstrated why they have struggled to score goals. Sweden had 15 shots, five on frame, while holding South Korea to zero shots on goal. He is the tallest player on South Korea's team at 1.97 meters (6-5 1/2).
Sweden: Granqvist was inspirational for Sweden, but the team still missed chances up front and that needs to be addressed before the match against Germany.
The Swedes have been trying to get the upper hand against South Korea using tactics which might be considered underhand. Both teams are in Group F, along with Mexico and Germany. "We need to dare to attack".
South Korea were disappointing throughout, with star man Son Heung-min unable to demonstrate any of the threat that has made him a firm favourite with Tottenham fans in recent seasons.
South Korea's World Cup team responded to a Swedish spy for Sweden's team by swapping their jerseys so it would be harder to tell them apart.