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Preocupados por el gran número de científicos de primer nivel que están cometiendo suicidio, una agencia internacional con sede en China intenta reclutar al joven investigador especialista en nanotecnología, Wang Miao, para que se infiltre en la organización "La Frontera de la Ciencia".

Wang Miao visita a Ding Yi, el afligido prometido de Yang Dong, quién le relata en un extraño juego de billar la frustración de Yang Dong por la extrema variabilidad de los resultados del acelerador de partículas. Wang Miao acepta a regañadientes su invitación a participar en una reunición del grupo Fronteras de la Ciencia. Más tarde, en el funeral de Yang Dong, conoce a su madre, Ye Wenjie, y le ofrece una fotografía que tomó de su hija, pero se percata de una una marca de tiempo extraña en ella. Sin embargo, en el estudio de su casa, descubre que todas sus fotos tienen una marca de tiempo similar. Después de experimentar, concluye que las marcas de tiempo son una cuenta regresiva que finaliza en 49 días.

Después de una serie de frenéticos experimentos para determinar la fuente de las marcas de tiempo en las fotos, Wang Miao comienza a ver la cuenta regresiva en el centro de su propia visión. Un oftalmólogo amigo de su esposa determina que no hay nada físicamente malo en sus ojos. Sin otras opciones, Wang Miao vuelve ver a Shen Yufei de Fronteras de la Ciencia en busca de consejo, y ella le sugiere que, para dejar de ver la cuenta regresiva, detenga sus experimentos de nanotecnología.

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.

Wang witnesses the universe flicker for him. With encouragement from Shi and his family, he decides to fight against whoever is behind it.

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.

Wang decides to take on the undercover job. He is presented with a game that claims to showcase the world of a highly advanced alien civilization.

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.

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

Shi suggests that the cause of Yang's death took place in the last three days of her life. Wang goes to Ye in order to learn more about her history.

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.

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.

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.

Yang tries his best to keep Ye away from the core of Red Coast. Lei personally engages Ye for unknown reasons.

Wang gains insight from gaming with Dou. As "Copernicus," he presents a radical theory, facing danger but advancing understanding.

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.

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.

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.

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.

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.

Wang receives an invite to the ETO meeting. Clues reveal Chen as an ETO member. Wang prepares for the meeting, knowing it implicates Ye.

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 learns of Trisolaris and decides humanity's fate. She reveals the significance of Wang's research. Shi takes action against Chen, averting disaster.

Ye learns of her pregnancy just before Lei's attempt to monopolize the Trisolarian message.

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 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.