What is the irony in a step from heaven?

An example of irony in the book is that when Young Ju's family is in America they refuse to speak English outside of their home and do not pick up some American traditions although before they moved, uhmma wanted Young Ju's hair curled so she would look like an American girl. Years after they moved, still not letting go to their Korean lifestyle, Young Ju is invited to her friend's birthday party who is an American. She is not allowed to go at first because her apa says she is becoming "too American."