Lee Eun-sun is a Korean picture-book author and illustrator who studied Korean literature and design before working in children’s publishing and illustration. Her original picture books include Winter Forest Friends, If Only I Could Change, The Black Chameleon, Press, Press, A Monster Appeared in My Room, and The Day the Earth Split in Two. Her work frequently explores difference, adaptation, self-acceptance, and relationships between living things through clear visual concepts. In The Day the Earth Split in Two, she uses animals changing across contrasting environments to introduce ecological adaptation while encouraging readers to reflect on climate change, resilience, and recognizing one another beyond visible differences.