The Revival of Time. The Official Continuation of The Three-Body Problem by Liu Cixin

In the midst of an interstellar war, Yun Tianming finds himself on the front lines. Terminally ill with cancer and deciding to end his life, he is frozen and sent into space. There, he is picked up by the Trisolaran fleet. After decades of brutal torture, Yun surrenders and begins to collaborate with the aliens. He helps enslave humanity. Receiving a healthy cloned body, Yun leads the life of a traitor and an exile. Before his death, he is granted another reprieve – another revival. A certain Consciousness draws him into the fight against an entity threatening our Universe… But Yun refuses to be a pawn again and devises his own plans to save the future of humanity…