Jang Keonghae was born in 1976 in Seoul and graduated from Sungshin Women's University with a degree in Korean Language and Literature. Jang studied illustration at Hangyeore Illustration School (HILLS) and won the Seoul Fairy Tale Illustration Award. Books illustrated by Jang Keonghae include The Candy Wet with Spit, Have You Ever Seen the Man?, The Curse Test, The Place to Sit, The Beautiful Tailender, Ttongmani, and Oops, My Life Line Gets Shorter.