How did Anyi and Anyi switch in winning the bid?

The promoter is a Cantonese who can't speak Mandarin. Er's Cantonese pronunciation and the development of Yi's Putonghua are both "Yi language", but their tones are different. When he looked at the lottery results, Anyi's "one" and Anyi's "two" were in Cantonese, so Anyi and Anyi made a mistake with each other, which was equivalent to switching.