When calling, especially when calling the first person, various feelings will break up in our hearts. Whether that person is fine or not troubling, will I accept you, expectation and anxiety simultaneously rising up, the voice of the opponent comes into my ear while my chest aches. And we will sense air flowing for a moment.
Even adults taste such pounding things, so it is even more likely that children who have less contact with others yet. The girl becomes an adult's face and carefully holds the receiver and listens. This clean tension has beauty that adults do not have.