When Son Jun-ho, a key midfielder for South Korea’s World Cup soccer team, signed with a Chinese club, he was an indication of China’s ambition to dominate the world’s most popular sport. But after Chinese police officers detained him two…

When Son Jun-ho, a key midfielder for South Korea’s World Cup soccer team, signed with a Chinese club, he was an indication of China’s ambition to dominate the world’s most popular sport. But after Chinese police officers detained him two…