Why does the captain of the Korean football team wear a mask?

In order to play a fixed and protective role. Son Heung-min, the captain of the South Korean football team, was competing in the Champions League at the beginning of the month. While fighting for a header, his eye socket came into "close contact" with the opponent's shoulder. He suffered a fractured eye socket and needed a long period of time to recover. But as the captain of South Korea, he needed to compete in the World Cup, so he wore this mask for fixation and protection.