What is the plot of the Heart of the Swarm in StarCraft II?

The plot of StarCraft II's Heart of the Swarm tells the story of humans on Earth who are forced to enter the depths of the Heart of the Swarm after a mysterious incident to fight against the alien intelligent creatures, the swarms. At the beginning of the story, the Earth suffered a mysterious event that caused a large-scale blackout and communication interruption around the world. The scientists could only gradually uncover the truth of the incident through surveillance videos and clues in the ruins. It turned out that there was a huge civilization hidden in the heart of the swarm. This civilization had powerful technology and a powerful army. Their goal was to conquer the entire universe. The humans on Earth were forced to form an organization called the "United Defense Force" and began a difficult battle. The Zerg's mothership, the Storm, was attacked by the Dark Forest organization that suddenly appeared. The United Defense Forces had no choice but to launch a counterattack. In the battle, the leader of the swarm, the Dark King, was defeated by the leader of the United Defense Forces, Orion. As the King of Darkness's death bug horde split apart. Some of the bugs chose to continue attacking Earth, while others left Earth to begin their own exploration journey. In the end, the United Defense Forces found the remaining Zergs and successfully defeated them. During this process, the relationship between humans and the bugs gradually eased, and humans began to understand and respect the culture and lifestyle of the bugs. Finally, the internal division of the swarm was resolved, and the swarm was liberated. They established a friendly relationship with humans and became a new force in the universe.