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.

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