Yoon-Kyung Kim (born January 6th) and Eun-Sook Jung (born October 25th) form the Korean art duo known as Kara. Their first book, Terra, won the first annual "Cake Comic Book Award" in Korea. The team debuted in a bi-weekly Korean manhwa magazine called Bijou. Kara have enjoyed success with the English language releases of their other works, Demon Diary and Angel Diary (released by Yen Press).

YunHee Lee is an author living and working in Korea who paired with the duo Kara for the bulk of the manhwa DEMON DIARY and worked as the sole author on ANGEL DIARY, its sequel.