As South Korea's sole threat, it was fitting that Tottenham striker Son gave his side fleeting hope in added time with a sublime, curling strike from 25 yards.
Mexico lead with six points from two games while South Korea have lost both matches and have only a remote mathematical chance of progressing. Chicharito's first goal in the competition was the insurance marker his team eventually needed to vanquish South Korea.
And all of them should be afraid of Mexico.
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.
Lozano probed the South Korean defense and laid the ball off to Hernandez, who became the first Mexican worldwide to score 50 goals for his country. If Germany fails to win, Mexico locks up a spot in the round of 16.
El Tri's form, confidence and collective spirit in Russian Federation surprised everyone in its World Cup opener, and Juan Carlos Osorio's team won't pass up the chance to announce itself as Group F's team to beat when it faces South Korea.
South Korea coach Shin Tae-yong stuck to his attacking line up but shook up his midfield with Ju Se-jong and Moon Seon-min coming in for Park Joo-ho and Koo Ja-cheol, as the 2002 semifinalists seek to recover from their opening 1-0 loss to Sweden.
Carlos Vela stepped up to slot the ball home, sending South Korean goalkeeper Cho Hyun-Woo the wrong way from what was the 14th penalty in 28 games at Russian Federation 2018.