The South Korean side were brushed aside as Cesar Delgado struck twice for the Mexican team.
Jesus Corona also netted, and the Mexicans now face the European champions on Thursday for a place in the final.
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Summer 2016 is set to be a very exciting time for football fans, as this is when the long awaited Euro 2016 tournament kicks off.
Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.