What is "guiyeoni"

Guiyeoni (born 1985 in Jae Chun, South Korea) is the penname of Internet novelist Lee Yoon-sae. She first reached fame with her novels He Was Cool and Romance of Their Own, which spawned commercially successful films of the same name, as with another book, A Wolf's Attraction. Since then, one of her other books, Do Re Mi Fa So La Ti Do, has become a film starring Jang Keun-suk. A movie of To My Boyfriend is also in planning stages. Despite her commercial success, Guiyeoni has been criticized for her lack of literary perfection, overuse of emoticons, and unrealistic setting in her works. Besides the aforementioned novels, she has also written Africa, Five Stars, and written and illustrated a manhwa called Syndrome.