Why did Ren Ziwei apologize to Lin Xiaojun?

Lin Xiaojun did not return. Ren Ziwei is a Chinese short track speed skater who won the championship in the men's 1,000-meter short track speed skating final at the Beijing Winter Olympics. He mentioned in a live broadcast that Ren Ziwei apologized to Lin Xiaojun for not returning to Lin Xiaojun. Lin Xiaojun, male, was born in South Korea and is a short track speed skater. In June 2020, Lin Xiaojun became a Chinese citizen.