'Secret' is a Chinese romance movie that was released in 2007. This film is a "simple but very beautiful" love story based on the own experience of director Ju Gol-ryun. Filming started in January 2007 and was completed in March of the same year. Zhou's first film, with a budget of about 65 million new Taiwan dollars, Zhou Geulyun himself wrote and directed.
'Secret' is a fantasy romance movie that begins when a transfer student, a piano genius, meets a female student playing mysterious music in an old practice room. Do Kyung-soo takes on the role of the male protagonist Joo Gol-ryun played in the original. Director Seo Yoo-min, who made his debut with ‘Memories of Tomorrow’ starring Seo Ye-ji and Kim Kang-woo, was in charge of writing scripts such as ‘Happiness’ and ‘April Snow’ by director Heo Jin-ho and ‘You call it passion.’ The shooting begins in the second half of this year.