As the moon grows fuller each night, Su-Jin’s halmoni (grandmother) prepares for the biggest Korean holiday of the year—a time for family, gratitude, and remembrance. Eager to share the celebration, Su-Jin invites her friends Maddy and Keisha to help Halmoni get ready. Together, they prepare traditional foods, wrap gifts in colorful cloth, play festive games, and learn how to honor ancestors. Along the way, the girls discover how to wish each other a happy Chuseok in Korean and explore the connections between Korean and American Thanksgiving traditions.