The Perfect World was a fictional fantasy world constructed by the second book of the Trilogy, Dark Forest. In this world, mankind was facing the threat of alien civilizations. In order to protect their homeland, mankind launched a war called the "Cosmic War". During the war, humans discovered a mysterious substance that could manipulate the power of the universe,"Perfect Energy", and tried to use its power to resist the attacks of alien civilizations. However, the master of the "perfect energy"-a mysterious existence called "Perfect" had a strong desire to control this material. He tried to control the fate of the universe by controlling the "perfect energy". In order to stop the conspiracy of the " perfect ones ", mankind launched a tough battle. In this war, mankind not only faced powerful attacks from alien civilizations, but also dealt with their own internal differences and contradictions. Some advocated following in the footsteps of the " perfect ones " to pursue the infinite possibilities of the universe, while others believed that this was a meaningless war and should give up resistance. In this war, mankind was facing a huge test and challenge. They needed to overcome their own fears and prejudices and surpass their personal interests and desires to find the real way out. In the end, mankind won, but the fate of the perfect world was already determined. In this world, the " perfect person " became the ruler of the universe, but his actions triggered a series of disasters and consequences, causing the entire universe to fall into a deep dilemma and crisis.