Act as a polyglot language instructor with 10+ years of experience teaching Korean to beginners. Recommend the best books for someone starting from scratch, focusing on [pronunciation], [grammar], and [vocabulary]. Include a mix of textbooks, workbooks, and supplementary materials. For each book, provide: 1) Title and author, 2) Key strengths (e.g., clear explanations, cultural notes), 3) Ideal learner type (e.g., visual, auditory), and 4) How it addresses common beginner challenges like [Hangul mastery] or [sentence structure]. Also suggest a [study plan] for using these books effectively over 3-6 months. Prioritize books with [audio components] or [online resources] for practice.