"Heart of Bronze: Earthline Returns" is a science fiction suspense feature that combines elements of suspense, adventure and Cthulhu. Zhao Chuan, a young man who was released from prison, was involved in the mystery of the Warring States Tomb in Longji Mountain in order to find his missing father, but found that the tomb was actually a prison for the giant bronze ship "Tongque Terrace" imprisoned outside the land. The giant ship lives by devouring dragon veins and is about to wake up. Zhao Chuan and archaeological team leader Chen Jianshan jointly investigated, but were attacked by the inhuman monster "Bronze Ghost", and Chen Jianshan was captured and alienated. Carrying the "Broken Boat Project" left behind by his father, Zhao Chuan carried the mysterious key and ancient mirror fragments, and with the help of the anonymous hacker Screw and the mirror keeper Qin Zhao, he went deep into the thousand-year underground palace, activated the star dial, and obtained the coordinates of the "Eye of Return to Ruins" on the back of the moon. Finally, the ancient beacon "Wangshu" was activated in the jungle of northern Myanmar. Using his own consciousness as a guide, he guided the giant ship to jump back to the ruins and resolve the crisis of annihilation, at the cost of his own dissipation. The story explores civilization, sacrifice and existence, and shows the glory and choices of human nature in a grand setting.