The film 'Beautiful Rascally Happy', directed by Selma Vilhunen and written by Ilona Ahti, presents the life story of Kaija Koo, one of Finland's most successful female artists. The character is embodied by Oona Airola, who immerses herself in Koo's persona, supported by Jari Virman who plays Koo's ex-husband, Markku Impiö. The narrative spans over 40 years of Koo's life and career, touching on both thrilling and tumultuous moments that provide a deep look at the artist's journey.

'Beautiful Rascally Happy' is not merely a biopic; it also serves as a celebration of Koo's legacy through her timeless hits, which resonate with the audience on a nostalgic level. The film captures the essence of Koo's performances, showcasing Airola's ability to replicate the nuances and quirks of the singer, leading viewers to ponder whether they are witnessing Koo herself or Airola's captivating portrayal. The integration of these musical elements enhances the film's emotional appeal, drawing viewers into the world of one of Finland's beloved musical figures.

However, the review hints at a 'disappointing solution' revealed from behind the scenes, suggesting that while the portrayal is authentic, certain creative choices might not meet audience expectations. This element raises questions about the balance between artistic representation and the actual life experiences of Koo, which could stir discussions among fans and critics alike about the nature of biographical storytelling in cinema.