Who directed a film based on a work that is also called "Crush On You"?
Love Story (manhwa):  "Pure/Romantic Comic" or the Korean version of shōjo manga; internationally, it is also known under the titles Love Story and Crush On You) is a webtoon by Kang Full. Hello, Schoolgirl: Hello, Schoolgirl (; literally "pure/romantic comic," the Korean version of shōjo manga) is a 2008 South Korean film. Hello, Schoolgirl:  Adapted from "Love Story", a popular webtoon by Kang Full, it is the second film directed by Ryoo Jang-ha.
i don't know