709 is a secret organization that studies supernatural phenomena. Its mission is to study events that science cannot explain and uncover the truth about this world. New agent Jin Mushui and female agent Dong with superpowersLing was ordered to investigate the dragon falling incident in a certain area of Liaoning in 1934. The two of them returned to 1934 through the time and space gate, hoping to unravel the truth behind the true dragon falling incident in history. However, they found themselves caught in a dilemmaIn a crisis.