Ye's interrogation of former Red Guards yields no remorse. Wang joins her team. Ye meets Evans, who, disillusioned with humanity, builds "Judgment Day," inheriting wealth but not his father's business.
Ye learns of Trisolaris and decides humanity's fate. She reveals the significance of Wang's research. Shi takes action against Chen, averting disaster.
Ye proposes using the sun to send signals into space, facing opposition. Despite risks, she conducts the experiment secretly. Years later, she receives three ominous messages from space.
Ye mourns Shen and suspects Pan's involvement with ETO. Wang and Shi observe ETO's internal divisions. The Operations Center locates the game server, while Pan shuts it down calmly. Wang learns of Three-Body's departure.
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.
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.
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.
Transferred to a secret department, Ye learns the truth about Red Coast with Yang's help. Despite the disappointment, she stays, driven by the pursuit of extraterrestrial life, bidding farewell to Wang.
Shi and Wang encounter a murder investigation on their train journey to Hailar, realizing Shen is targeted by another formidable force. Ye advises Shen's safety while sharing her past with Wang.
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 enters the game again and witnesses a model showing a possible structure of the universe. The civilization this time is destroyed with the sun approaching rapidly.
Ye was accused of reading a forbidden book and writing a letter that conveyed anti-revolutionary ideas. She was given a way out, but with one condition: to accuse her father as anti-revolutionary even after his death.
The civilization is demolished in the game, leaving Wang overwhelmed by how real it feels. No one can find any information on the game developer. The General decides to put top scientists in military custody for protection.
Many scientists across the world commit suicide. Wang Miao, an applied physicist, is asked to do an undercover job in an organization called The Frontier of Science.