Guan Yu and Zhang Fei were high school students, but due to their excessive love for chivalry and righteousness, they were expelled from twenty-four schools, earning them the nickname "The Twenty-Four Schools"! Just as the two were feeling desperate after yet another expulsion, a man with large earlobes suddenly appeared. He introduced himself as Liu Bei, styled Xuande, a member of a fallen noble family who often changed schools because he couldn't afford the tuition fees. Liu Bei proposed a plan: since he had noble bloodlines, he could attend the best aristocratic school in the country - the Donghan Academy. However, it was extremely expensive and only members of the royal family or nobility were allowed to enroll. Zhang Fei, being wealthy, said he could help pay the tuition fees. Liu Bei added that as long as the financial issue was resolved, everything else could be solved. He suggested the three of them swear brotherhood, making them all members of the royal family, thus allowing them to enroll. The three then went to a beautiful and meaningful place to swear brotherhood. As soon as they finished saying, "We do not seek to be born on the same day, month, and year, but we wish to die on the same day, month, and year," four people from the Iron Time-Space - Xiu, Wang Dongs, Ding Xiaoyu, and Wang Yase - suddenly appeared through a time-space portal in the Silver Time-Space. Due to Dongs accidentally dropping a coin, which caused a series of chain reactions, a falling rock hit Liu Bei, killing him! Guan Yu, who valued promises, wanted to follow his elder brother and die on the same day. Zhang Fei tried to stop him but failed, so he knocked Guan Yu unconscious first. They then discovered that Liu Bei wasn't dead, just seriously injured and unconscious. After discussing with Dongs, Xiaoyu, and Yase, they decided to leave Xiu, who looked like Liu Bei, in the Silver Time-Space as a substitute. Reluctantly, Xiu agreed to maintain the order of time and space. Meanwhile, the other three took the severely injured Liu Bei back to the Iron Time-Space for treatment. When Guan Yu woke up, he found out that Xiu pretending to be Liu Bei was still alive, making him very happy. Zhang Fei was also glad that they didn't have to die together. Thus, the three finally entered the Donghan Academy, where Guan Yu and Zhang Fei believed they would surely make a name for themselves!
The three hoped to study well and graduate from the Donghan Academy. However, due to its prominence, it attracted attacks from Gold University and Hedong University (where Dong Zhuo was the principal), putting the Donghan Academy in constant danger. Master Zuo Ci even set up the 'Eight Gates Golden Lock Array' at the school gate to block the students from attending classes. Naturally, the three took the responsibility to break the array. However, breaking the Eight Gates Golden Lock Array was not easy. Even Xiu, pretending to be Liu Bei, and Xiao Qiao were trapped in the array, facing life-threatening dangers. Therefore, Guan Yu and Zhang Fei accepted the suggestion of Cao Cao, the student council president, and sought help from Ma Chao, an extremely resilient and cheerful young man, and Huang Zhong, Ma Chao's good friend and a perfect marksman. They also included Zhao Yun, a super handsome young man who always conflicted with them, to form a team to break the array and rescue Xiu and Xiao Qiao. During the process of breaking the array, Guan Yu saved Zhao Yun's life by blocking an arrow with his arm during a critical moment. This act resolved the previous conflicts between Zhao Yun and Guan Yu and Zhang Fei. From then on, Zhao Yun became brothers with the other four, showing loyalty and mutual support, and together they successfully broke the Eight Gates Golden Lock Array.