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.

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.

Hu Xiaoxi, who was Pan's messenger, turns himself in. Wang and Shi go to Shen's place seeking the truth.

Wang goes to Ye to learn more about Red Coast. Ye tells him about her experience of being selected as a member of the base.

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.

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.

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.

Ye reveals Trisolarans sent sophons to halt human science. Wang learns about Yang's suicide.

Shi proposes using Wang's flying blade to slice Judgment Day, aiming to secure Trisolarian data.

Shi and Wang continue the game, uncovering the Trisolaran monitoring stations akin to Red Coast Base on Earth, receiving awaited messages from space.