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.
A movie adaptation of To My Boyfriend is being looked into. Although Guiyeoni's books have been commercially successful, she has faced criticism for not achieving literary excellence, relying too heavily on emoticons, and creating unrealistic settings in her works. In addition to the mentioned novels, she has also written Africa, Five Stars, and created a manhwa called Syndrome.