This movie is a genre clusterfuck but its pretty entertaining.
Save the Green Planet! (Korean title: 지구를 지켜라!, Jigureul Jikyeora!) is a South Korean film, written and directed by Jang Jun-hwan, released on 4 April 2003 . The movie mixes elements of multiple genres, including comedy, science fiction, horror and thriller. The basic story begins when the main character, Lee Byeong-gu, kidnaps another man, convinced that the latter is an alien.
The film's main character is Byeong-gu, a man who believes that aliens are about to attack Earth and that he is the only one who can prevent them. With his childlike circus-performer girlfriend, he kidnaps a powerful executive whom he believes to be a top ranking extraterrestrial who can contact the prince of these aliens during the upcoming eclipse. After imprisoning the man in his basement workshop, he proceeds to torture the executive and slowly Byeong-gu's true intentions are revealed.
It seems that the executives company poisoned his mother in a pharmacy test, and though Byeong-gu does seem to believe...