Sweden 1-0 South Korea Andreas Granqvist penalty after VAR intervention hands-
Group F got off to a sensational start on Sunday when world champions Germany were beaten by Mexico but this never looked like matching that clash for excitement.
However, Sweden ran out worthy winners, thanks to a second-half Andreas Granqvist penalty.
Sweden dominated much of the first period and had chances to take the lead, the best of which saw Marcus Berg, six yards out and with the goal gaping, fire straight at Cho Hyun-woo.
Berg would also flick an effort wide before the break, while Robin Olsen at the other end barely had a save to make.
South Korea's 4-3-3 formation gave them an extra man in midfield, but they made little impression and Tottenham's Son Heung-min cut a frustrated figure.
Twenty minutes into the second period Sweden's dominance was made to count, with the video assistant referees intervening after match official Joel Aguilar had waved away appeals after Kim Min-Woo's challenge on Viktor Claesson.
South Korea launched a counter as Swedish players appealed and eventually the officials colluded to come to the right decision. With the penalty given, ex-Wigan defender Granqvist stepped up to send the goalkeeper the wrong way.
South Korea never looked like getting back into the match from there, and now Sweden face defending champions Germany on Saturday, knowing they can potentially knock Die Mannschaft out of the tournament.
All the drama as it unfolded, below....
Sweden XI: Olsen; Lustig, Granqvist, Jansson, Augustinsson; Larsson, Ekdal, Forsberg, Claesson; Berg, Toivonen.
South Korea XI: Kim; Lee, Park, G Kim, Jang Hyun-Soo; W Kim, Koo Ja-Cheol, Lee, Ki, Kim Min-Woo; Son, Hwang Hee-Chan
Andreas Granqvist 65'
Andreas Granqvist, FIFA World Cup, World Cup Group F, Sweden football team, South Korea football team, World Cup Live,