Ma Ildu (M) studied Education at the Keimyung University Graduate School. For Column Issue Story, he was invited to 24 broadcasting appearances in 5 months of publication. He has written the picture book Water Drop Contest, and he makes a living by submitting columns to newspapers, writing children’s stories and essays, and hosting lectures about leadership and children’s stories at companies, culture centers, elementary schools and public libraries. In Who is the Strongest?, while each and every animal claims to be the strongest,  when a crisis comes, they combine their strengths to overcome it. The meaning is that although humans are weak individually, with a combined effort, we are able to overcome any challenge. Ma hopes that children reading this book will be able to grow to love and cooperate with one another rather than just engaging in selfish competition.