Song Ji-hyo
"Sex Is Zero 2" was produced by Doosaboo Film with CJ Entertainment in charge of distribution. Filming commenced late July 2007 under first time director Yoon Tae-yoon, with Im Chang-jung reprising his role from the original "Sex Is Zero" as male protagonist Eun-sik. Other actors returning from the first film were Choi Sung-kook, Shin-ee and Yoo Chae-yeong, though the female lead was played by Song Ji-hyo in place of Ha Ji-won, with Ha making only a cameo appearance in the film's opening sequence.