Why is Tiancheng Cai Yi called a country idol?

Fan title. Tiancheng Cai Yi is the hero in the second season of Idol Dream. Anime fans affectionately call the man a country idol. The boy with red hair is called Tiancheng Cai Yi. He comes from a remote and isolated rural area and doesn't know much about the outside world, especially the city. Although he did a lot of homework, his words and deeds made people feel strange.