Record temperatures were recorded in the South Korean capital in the build-up to kick-off, with the thermometer sitting around 36 degrees Celsius as the match got under way.
It mattered little for Manchester City, with Rayan Ait-Nouri, Tijjani Reijnders and Divin Mubama scoring first-half goals to secure a comfortable win that also marked Maresca's first victory in charge, in just his second friendly after last Saturday's 1-1 draw with Inter kicked off the tour. Speaking in his post-match press conference, Maresca chose to focus on his players' effort in trying circumstances rather than the result itself.
"For us the result is always important, even if it is a friendly game - but the most important thing is to see the effort of the players, especially in this weather," he said.
"Also, compared to the last game in some aspects we did some things better. The good thing is the players tried to adapt [to the weather]. They made an effort for 95 minutes."
Maresca added that the response from his squad since he took charge has been a source of encouragement.
"Since day one, the players are putting in the effort and I can see that they trust the job we are doing and, for me, this is the main thing," he said. Those City players who reached at least the quarter-finals at this summer's World Cup are due to link up with the squad back in Manchester next week, just days before the Community Shield, and Maresca conceded it will take time for his side to hit their peak while so many senior players remain absent.
"The reason why is because around eight or nine players are still not here with us," he explained. "But the important thing is when they are here they make the effort to do the things we have been trying to do since day one. Also we need them to trust what we want, that is important and then when the rest of the players arrive there is no doubt we will be even better."
City now have one final pre-season fixture to come before returning home to prepare for the Community Shield against Arsenal, giving Maresca a last opportunity to assess his squad's fitness and cohesion in unfamiliar conditions before the more serious business of the Premier League title defence begins.
The Italian's win over K-League All Stars, coming after a hard-fought draw with Inter to open the tour, offers early evidence that his methods are beginning to take hold even with a significant portion of his strongest players still absent, a point he was careful to make clear applies as much to squad culture as to results on the pitch.
With Reijnders, Ait-Nouri and Mubama among the scorers, the win also offered a reminder of the attacking depth already available to Maresca even before his World Cup contingent returns to bolster the group further.