Kim, Yujin studied industrial design at college and worked as a graphic designer at a theme park. Books and illustrations were her two best friends during her childhood. Remembering her own childhood, Kim hopes to make books that present joy to kids. She has illustrated a number of books, including 『A Family That Hides Their Tails』; 『Konga, a Stray Cat』; 『Cats' Museum』; 『The Day You Come』; 『A School that Has a March Brea』k; and 『Forest Wind Library』. Kim is also the author and illustrator of the picture book, 『Choi, the Firefighter Cat』.