"One book a day, Expo 3000" is a large-scale children's reading promotion plan being carried out by Korean children's education publishing institutions. They believe that the cultural quality and competitiveness of citizens should start with children and reading. They advocate that children read one book a day, 3,000 books, from infancy to primary school (3- 12 years old). Helping children grow into readers is the best gift parents can give their children. "hello! Math series (30 volumes) and (Hello! Science) series (50 volumes) is the key promotion variety in this reading promotion plan, and it has almost become a must-read book for Korean families.