A nanomaterials expert sees a mysterious countdown superimposed in his field of vision and finds himself under military investigation. To unravel the mystery, he enters the VR game "Three-Body" developed by a secret organization ETO and discovers the truth behind the deaths of dozens of scientists and a tragedy from the days of the Cultural Revolution. Adapted from the novel "The Three-Body Problem" (三体) by Liu Ci Xin (刘慈欣).