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Late at night in the Forbidden City, a senior researcher who was familiar with the "Book of Changes" died suddenly in front of the Hall of Supreme Harmony in the shape of "He Tu Luo Shu". Semiotics professor Lin Mo and national security agents were forced to join forces to discover that the Forbidden City itself is a huge "Dragon Vein Code Map", and the key is hidden in the sixty-four hexagrams and the mystery of the "real dragon bones" that emperors of the past generations dared not disclose.