Clarence came to CERN and found that many projects here had been stopped, and some scientists had committed suicide here.At the scene, he found a doctor's gaming helmet, which aroused his alert.In England, the Oxford Five gather at Jack's house, and Oggy notices that Jack also has the helmet.After entering the game, Jack is also killed immediately.After questioning, they learned that this was a game that Ye Vera played before her death, but they did not know who invited them to join.What's even more disturbing is that Oji discovers that the helmet has been secretly put into Jack's home, and the surveillance video has been tampered with, which is eerily similar to her previous conversation with the air woman.

Saul speculates that this game may have caused Ye Vera's disorder.Aoji was worried about everyone's safety and hoped that everyone would stop playing, but Cheng Jian and Jack continued to discuss it in private.Cheng Jian's hypothesis is that the sun may be moving erratically, and she needs Jack's help to get into doubles mode and present her idea to the Pope.However, the Pope considered her a heretic and tried to burn her.At this time, a rare astronomical phenomenon occurred in the outside world - a three-day volley, and the world fell into chaos.The female swordsman appears again, saying that Cheng Jian successfully revealed the basic structure of the galaxy, which is part of the three-body problem, allowing her to enter the third level of the game.

Clarence gradually understood the content of the game by observing the discussion between Cheng Jian and Jack.At the same time, the Ministry of Science and Technology discovered that the helmet is equipped with a retinal scanner, blood oxygen machine and brain wave detector to collect the user's biometric data.This means that while you are playing the game, someone is watching you.

When Cheng Jian and her boyfriend met their parents, her boyfriend's father shared the story of how he faked his own death due to hypoxia and how he seized enemy supplies for his comrades.Will undergoes surgery to relieve the pain of his cancer, and he enters into a strange symbiotic agreement with the cancer cells.Oji faces a career crisis. If she does not give up her research on nanofibers, she will be banned from working and living in this country.This made her feel stressed, and the countdown timer in front of her appeared again, making her feel overwhelmed.

Cheng Jian and Jack enter the third level of the game, and they try to prove the theory that the chaotic era has no solution.However, the computer actually calculated the time of one constant epoch.Cheng Yan speeds up the game to prove the computer's error. She realizes that the goal of the game is not to solve the three-body problem, but to save mankind.

Evans' organization has been monitoring the content of these games.Cheng Jian and Jack entered the fourth level and became Evans' new candidates.Evans and the Trisolarans were able to communicate with each other, and they discussed the differences between humans and Trisolarans.Trisolarans believe that a lack of fear will lead to extinction, so humans should relearn fear.Cheng Jian and Jack were invited to a bar to meet a mysterious woman.She asks them to reach level four in the game to reveal the truth.

In the game, the female swordsman talks about the unsolvable nature of the three-body problem and how every civilization will eventually encounter irrecoverable catastrophe.To solve the problem, she said, new homes must be found.Therefore, the Trisolarans have built a huge interstellar fleet to go to Earth, which is their hope of survival.In the game, followers develop a deep emotional bond with Cheng Tian, ​​whom they hope will welcome them to Earth.

Although Jack thought the aliens' claims were too bizarre, Cheng Yan was convinced.She understands the pain of being forced to leave her hometown, which was hit by floods when she was a child, and her parents died tragically before she moved to New Zealand to live.However, when Jack returns home, he is murdered by the mysterious woman Tatiana, and even Clarence is unaware of this happening.