The Korean Book Search plugin automates filling YAML frontmatter in notes with detailed Korean book metadata using the Aladin Open API. When a note titled after a book is created, the plugin retrieves and inserts relevant details such as author, publisher, ISBN, publication date, and cover image directly into the frontmatter. Users can customize default fields like reading status and personal ratings or add custom fields through plugin settings. It securely stores the required API key, streamlining metadata management for book notes.