This is a movie version of the mini series "Dziewczyna i chłopak" 　　Mini series: http://www.imdb.com/title/tt0269179/ 　　The idea of the story is based on shifting roles of brother and sister, very similar to each other externally, but having completely different personalities. 　　Holidays spent "in the skin" of the latter become a test for the siblings of mutual loyalty, perseverance,...