However, Jang Hyun-soo's handball gave referee Milorad Mazic little choice but to point to the spot - the number of penalties awarded in Russian Federation consequently surpassing the 13 across the entirety of the previous World Cup - and Vela, who announced the death of his grandfather following the win over Germany, converted.
"We can not afford to get caught up in all this, we have to continue our job and stay humble, of course we should enjoy this but tomorrow we start working again".
The Taeguk Warriors of South Korea enter the Mexico contest with a seven-game World Cup winless streak.
Hernandez added the second in the 66th, scoring his 50th goal for Mexico. "We are going to enjoy it", Hernandez said. Vela converted from the penalty spot in the 26th minute after Jang Hyun-soo handled the ball while trying to stop a cross from Andres Guardado.
South Korea wanted a penalty of their own after the restart when Moon Seon-min's strike clipped Carlos Salcedo's arm, but the referee correctly waved away the team's appeals.
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Tunisia lost 2-1 to England on Wednesday after an injury time header from Harry Kane. The tournament hosts came away with a 3-1 win in St Petersburg .
South Korean forward Son Heung-min scored a scintillating consolation goal in injury time but it was too little too late for the East Asian nation, which now can not qualify for the first knockout stage of the tournament. "Our talent and hard work have paid off".
Carlos Vela got the Mexicans on their way at the Rostov Arena with a 26th-minute penalty, before Javier Hernandez wrapped up the three points with a second six minutes after the hour mark. - In the first half, Son Heung-min had six shots (including blocked attempts) - more than South Korea managed in its entire first match against Sweden.
After the match - as is usual - passionate soccer fans spilled into the streets all over the country to celebrate the victory, including Mexico City where the capital's annual gay pride march is also being held today.
Mexico will face Sweden on Wednesday in Yekaterinburg with a chance to win Group F, a prospect that could set up a match against Brazil in the round of 16.
Even if Germany wins, it would still be extremely unlikely that El Tri would not qualify for the second round of the World Cup for the seventh consecutive time.
Let's look at the South Korea vs. Mexico betting lines.