How did Ying Er and Bi Hayden meet?

Meet the variety show "The Goddess's New Clothes". Bea Hayden and Yinger became attached to the star cross-border fashion reality show "Goddess's New Clothes". Yinger and Bi Hayden became good friends after they met on the show. However, because Ying Er and Bi Hayden are both very low-key people, we don't know that Ying Er and Bi Hayden have an unusual relationship.