Why is Son Heung-min wearing a mask for South Korea at 2022 FIFA World Cup?

South Korea forward Son Heung-min has been spotted wearing a mask while playing for his country in their 2022 FIFA World Cup opener against Uruguay. The 30-year-old is wearing a protective face mask as he underwent a surgery after suffering fracture around his left eye. He had sustained the injury during a Champions League match against Marseille on November 1.