I Stand on Three Sides with Immortals and Demons in Another World

At the end of the Tang Dynasty, in the decisive battle between immortals and demons, the immortals and demons mobilized collectively to form a giant tornado on the main battlefield when the battle was dark, sucking away all the immortals and demons, including a large number of ordinary people in various cities outside the battlefield. In 2399, Li Huaiyu, who belonged to the Tengli Space Exploration Group, piloted a spacecraft and disappeared into space after leaving the mothership... A thousand years after the development of human-immortal-demon system in the late Tang Dynasty in alien galaxies, in a world that advocates cultivating immortals and becoming demons, can high-tech from the future survive in this era of high-tech? Is there any chance of winning between high-tech and high-tech? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.