In an unexpected time travel, the protagonist Li Liang came to the Ming Dynasty and obtained a mysterious "system". With the military strategies and special abilities given by the system, he gradually emerged in this strange era. However, as the plot develops, Li Liang discovers that his time travel has triggered a huge crisis: the world coordinates are exposed, triggering the covetousness of powerful people from other dimensions. Therefore, he had to face the threat of alien invaders and try his best to protect the peace of the Ming Dynasty. In the process, Li Liang met another time traveler, Luo Ying, a person with similar abilities but completely different personality. The two went from initial opposition to fighting side by side to conflicts over their mission to protect each other, and experienced a series of ups and downs in their adventures. Just when Li Liang thought he had found a chance to return home, he fell into a bigger conspiracy: the guardian replacement mechanism of the dimension hub was triggered. He dedicated his energy to save Luo Ying, but was betrayed by the new guardian and lost his ability to be a guardian. However, just when Li Liang fell into despair, Luo Ying woke up. The two rediscovered the original intention and courage of guardianship, and understood that the true power of guardians does not come from the system or identity, but from the courage and love in the heart. In the end, they decided to return to the dimensional hub together to continue to protect more worlds and face new challenges.
