<p>Son will lead out his side on Thursday in the tournament's second match after co-hosts Mexico kick-off the showpiece against South Africa.</p><p><strong>"The guys are so fired-up for this match, and I actually have to calm them down," </strong>Son said at the pre-match press conference in Guadalajara.</p><p><strong>"I hope our hard work will bear fruit, and I think we absolutely deserve it. The vibe is tremendous, and I can feel it from the eyes of my teammates.</strong></p><p><strong>"Every World Cup match is so important that, as a player, you would stake your life on it. Tomorrow, we will give everything we've got and more."</strong></p><p>Former Tottenham star Son, 33, comes into his fourth and possibly his last World Cup after a poor season for his new club, Los Angeles FC, scoring just twice.</p><p>He said his excitement for football's global showpiece never dimmed.</p><p><strong>"My mindset is similar, whether it's my first or last World Cup. I feel like a child again,"</strong> he said.</p><p><strong>"I have never once said this is my last World Cup. The most important thing is to do my job. People can say whatever they want, and I will choose my path wisely."</strong></p><p>South Korea will face Mexico on June 18th before South Africa on June 24th in their final Group A match.</p>