Career
In 2007 she appeared in the horror film Epitaph as Asako, a young girl suffering from overbearing nightmares and aphasia, becoming so immersed in the role that she had to deal with sudden nosebleeds while on set. Kyu Hyun Kim of Koreanfilm.org highlighted her performance in the film, saying, " acting thunder is stolen by the ridiculously pretty Ko Joo-yeon, another Korean child actress who we dearly hope continues her film career.".