The goal was initially wiped out on an offside call, but a review by the video assistant referees (VARs) overturned the decision on the field, giving South Korea a 1-0 lead over shell-shocked Germany.
Son sprinted to retrieve a long ball, and with Neuer having gone upfield to try to help his side score, the Tottenham forward rolled a low, angled shot into the open goal to seal one of the most unlikely wins in recent World Cup history. At only No. 57 in the Federation Internationale de Football Association rankings, South Korea had to fight an uphill battle against defending champions Germany (No. 1), Latin American powerhouses Mexico (No. 15) and European dark horses Sweden (No. 24).
South Korea, meanwhile, are also in with a shout, despite losing both of their first two matches.
Shortly before the World Cup he extended his contract until 2022.
The goal was awarded because Toni Kroos' touch had played him onside, and minutes later Germany were 2-0 down after Neuer ran up the pitch in a desperate attempt to get a goal.
Despite enduring what has thus far been a frustrating World Cup, Timo Werner will now hope to end his wait for a first goal at a major tournament here against what is the weakest opponents Germany have faced so far in Russian Federation.
With Sweden beating Mexico 3-0 in the other group game, the Koreans fell just short of reaching the last 16 for the first time since 2010.
Hardly had Germany ever looked so vulnerable in a tournament in the past decade or so, and much of it is due to the influence of Joachim Low who instils a sense of calmness and stability into the squad.
The photo, taken before Germany's second Group F game against Sweden, was supposed to project calmness.
"We had a good training camp, the team has worked well and we felt we would shift gears but we lost to Mexico when a point might have been different and we just couldn't make that switch".
But in Kazan, 41,835 flabbergasted fans witnessed the fall of a titanic team that had made the semi-finals or beyond of every World Cup since 2002.
The mood in the dressing room must have been extraordinarily low and while Germany knew they needed to match Sweden's result, they can't have predicted today's events unfolding as they did. Swedish captain Andreas Granqvist scored a penalty kick goal in the 65th minute to hand South Korea their first defeat at the tournament. "We need to congratulate our opponents", an apologetic Loew said.
"Maybe we need one more match and he will be in his full form physically and technically, because he is outside the normal standards".
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