Kim Su-im, the mistress of an American colonel, is arrested and charged with being a North Korean spy. While not denying the charge, Miss Kim takes the trial as an opportunity to relate her life as an explanation of why she committed treason as a spy.

A newly discovered 36-foot gorilla escapes from a freighter off the coast of Korea. At the same time an American actress is filming a movie in the country. Chaos ensues as the ape kidnaps her and rampages through Seoul.