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.

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

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.