How did Balala Little Demon Fairy discover the Demon Fairy?

I heard the demon fairy speak. By checking the plot of the animation "Balala Little Demon Fairy", we learned that in the animation, Meiqi Miyuki's family was recruiting a nanny, and the Demon Fairy came down to earth to perform a task, so she went to apply for the job. "Balala Little Demon Fairy" is a TV series produced by Aofei Entertainment Co., Ltd., directed by Li Sijie, written by Qi Yuan, Lin Jieli, and Wang Wei, and written by Sun Qiaolu, Huang Anyi, Liu Meihan, Zhou Jiao, Yuan Qifeng, Liao Jingxuan , Wang Hui and other starring roles.