Interstellar String

1.5 Light-years away from the solar system, there is a brown dwarf with three planets on it, one of which developed primitive civilization. Three hundred years ago, the Terman Corporation developed a light-speed spacecraft and led mercenaries to invade the star system and develop the Terman Empire. Three hundred years later, the Earth Federation established the Tiansha Lone Star extraterrestrial exploration team and sent warships to the Oort Nebula to uncover the centuries-old history of civilizational invasion...