Three-Body Era

In 2075, humans received a signal from the Trisolaris galaxy, confirming the existence of alien civilization. The United Nations established the "Earth Defense Force" and launched the "Deep Space Project." The protagonist Lin Yuan is a doctor of astrophysics who accidentally obtained the "Interstellar System" - a legacy from a more advanced civilization. The system can be exchanged for super technologies such as space battleships, curvature engines, and two-way foils.