5) Mingyue's English teacher is host mom's friend and she afraid her conflict with host mom will affect her studying credits from that teacher. So, the student hasn't dared to tell natural parents and GP.
She admires her classmate's hosts Eduardo Latorre &Mafy and hopes to change host family to that student's. If GP couldn't change host family this semester for the student, the parents repeatedly express keep it secret (change host family and student's thought) to host mom. Otherwise, in the following life, it may intensify their contradiction.