Kim Jun-ho is a Korean middle-school ethics teacher who uses picture books extensively in education. He founded a teachers’ picture-book study group and has co-authored numerous books on picture-book discussion, classroom practice, restorative education, philosophy, and inquiry-based learning. The Pinch Runner reflects his interest in helping young readers recognize effort and value beyond visible achievement. Yong-dal is a Korean picture-book creator who studied metal craft, editorial design, and illustration before turning to picture books. He runs a small art academy and has written and illustrated works including The Magic Scissors and Demian. His energetic visual storytelling gives the hidden tension and speed of baseball vivid cinematic momentum.