"Twins are born, dragons rule the nine heavens" These two sentences in the 32-character mantra made the two great heroes Yuan and Dou start a battle for the world in the smoke of the troubled times! Yuan Qingjiang married the sister of Queen Lian and was instructed by the saint to search for five children with extraordinary backgrounds to gather dragon energy. Dou Xiang failed to find a wise man and killed Hua Bin, but his twin daughters Hua Mujin and Hua Jinxiu were brought into the Yuan Mansion by the Yuan family's secret people. Mujin relied on the wisdom taught by her father to help the five sworn brothers in distress to survive the test of life and death. However, the Hua sisters fell in love with the third son Yuan Feibai by mistake. Yuan Qingjiang saw the value of Hua Mujin and forced her to take "Life and Death". Once she was unfaithful, she would make the newcomer's martial arts useless or die suddenly. Feibai loved Mujin deeply, but he had a secret: Sima Ju, the twin brother in the Yuan family's underground palace, fell in love with Hua Jinxiu, causing a painful misunderstanding. Dou Xiang launched a palace coup and instigated the Nanzhao army to massacre the Yuan family. Mu Jin replaced the daughter of the Yuan Marquis to divert the pursuers, but unexpectedly caused the Southern Kingdom's prince Duan Yuerong to be "inseparable". Mu Jin helped him clear his grievances and restore the throne, and Duan Yuerong fell deeply in love with her. Mu Jin used the business training taught by her father, disguised herself as a man to do business all over the world, and secretly helped Fei Bai to regroup and make achievements. In the turbulent times, she performed a song of never leaving and staying together with her uncomplaining and deep affection.