While Zhizi locked down Earth's technology, the Three-Body Fleet was coming in full force and headed straight to the solar system.Faced with an unprecedented crisis, mankind began to form a huge space fleet. At the same time, the United Nations Planetary Defense Council took advantage of the fatal flaws of the transparent mind of the Three-Body Humans to formulate a "Wall-Face Plan" - Selected four human elites as "Wall-Facemakers" and launched a secret counterattack.

The three-body man relies on the "blocking man" selected among humans to engage in a smart game with him.With the help of the policeman Shi Qiang, the sociology professor and "wall-faced man" Luo Ji gradually understood the "dark forest law" that can clamp the three-body man through constant thinking; while Zhang Beihai, an officer of the Space Force, secretly promoted the research of the spacecraft without working fluid radiation, proposed the "reinforcement of the future" plan, hibernating with a group of outstanding talents, in order to inject key strength into the struggle of mankind in the future.