Who is Park Young Ju from A Step from Heaven and what is their importance?

Park Young Ju is the narrator of the story. The novel begins with Young Ju as a baby playing in the ocean with her father. The plot of the story follows Young Ju from childhood into adulthood as she immigrates from Korea to America with her family. Young Ju struggles to integrate into a new culture and learn a new language when she begins school. When she comes home from school, she is expected to teach her parents what she has learned.