Wang finds a countdown in the middle of his sight. He goes to Shen for answers.

Wang shuts down his experiment, and the countdown disappears. He visits Ye Wenjie in order to find a spot to observe the flicker of the universe.

Sha presents the theory that shows the flicker could be faked. Wang and Shi look through Ye's files and learn of her tragic past.

Shi and Xu uncover Shen's husband's secretive calculations. In the Three-Body game, triple suns cause chaos, leading to civilization's destruction. Mu learns truths from Pan and decides whom to trust.

Wang and Shi regroup, sharing findings and returning to Beijing. Xu continues Shen's investigation. Ye confronts ETO leader Evans, revealing ideological divides. Wei seeks solace in mathematics amidst threats.

Shen discovers Wei's Three-Body calculations at a temple, leading to their relationship. Despite threats, they seek refuge with Wang, who takes possession of a crucial USB containing their research.

Police find Shen's death a suicide, clearing Pan. Wang attends a Three-Body game meetup where Pan reveals extraterrestrial existence. Meanwhile, global preparation against the aliens begins as mistrust spreads.