"The Great Forensic Doctor Song Ci Series: Stealing Beams and Substituting Pillars" is a costume detective film that tells the story of how Song Ci used his superb forensic investigation skills to find clues under numerous difficulties, using evidence to get closer to reality step by step, and solving seemingly bizarre unsolved cases. The film reflects the advanced and superb forensic technology of ancient China, praises outstanding historical figures of China, and promotes patriotism.