What happens in China on Thursday will have a big bearing on Korea's chances of qualifying for the 2018 World Cup.
Three points in the city of Changsa will give the Taeguk Warriors some breathing space in the final round and set the team up nicely for Syria in Seoul five days later. Anything less than four points from these two games will be disappointing.
China may have beaten Korea only once in 30 meetings and never in a competitive game, but has reason to be more confident because the Taeguk Warriors have been uncertain in this qualification round.
With five games down and five games to go, Korea has 10 points. Nine of those have come at home with two away performances, against Syria and Iran, which were as poor as the results.
Only the top two from the six-team group qualifies automatically for the 2018 World Cup. At the moment, Iran is top with 11 points, one more than Korea, and then Uzbekistan on nine.
As well as home advantage, China will be relieved that Son Heung-min is suspended. The Tottenham Hotspur star, who scored three last weekend to take his season tally to 14, is in form and dangerous. He shone when Korea beat China 3-2 in September.
Those are the only goals that China has scored in the five games, but sooner or later that will change.
There will be a crowd of 55,000 in Changsa, and with relations between the two countries at a low point due to political reasons, the atmosphere could be red hot.
"The match against China will probably be our second most pressure-packed match in this qualifying round after Iran," Stielike said.
"I will try to make sure our players won't be influenced by the stadium atmosphere or other off-pitch situations."
The German has put the loss and performance in Iran down to the intimidating atmosphere in Tehran. It is a convenient excuse, but the Koreans will have to deal with the environment.
"In this qualifying round, our most disappointing match was against Iran," he said. "The players could not do their jobs because they felt the pressure from the stadium atmosphere.
"But I think that experience will serve as a good lesson for this match against China. The players should now know how to handle that kind of atmosphere."
China has just two points from the five games and is not about to take one of the top two automatic places. But there is a new coach in Marcello Lippi, one of the most successful in the history of the game.
The Italian led his homeland to the 2006 World Cup and is the only coach to have won Champions League titles in Europe and Asia, taking Guangzhou Evergrande to the 2013 title against Seoul in the final. He has returned to his former club with seven of its players in his squad.
Home advantage, an elite coach and no pressure or expectations against a fierce rival makes China a tough opponent.
It is not just a test of whether the players can handle the atmosphere but whether Stielike can handle Lippi.