Flurry of Sui and Tang Dynasties: I Cried with Anger and Made Thousands of Time-Travelers Cry

When he woke up, Yang Xuan traveled through time and became Yang Guang's son. He was inexplicably bound to the system of saving the Sui Dynasty, and his first mission was to rescue Yang Guang, who was forced into the palace by Yu Wenhuaji. With the help of the Overlord Power experience card, Yang Xuan killed Yuwen Chengdu, the second most powerful general of the Sui and Tang Dynasties, with one shot, and successfully rescued Yang Guang from disaster. When Yang Xuan learned that Yang Guang was not dead, disrupting history, and that countless time travelers would come to the Sui and Tang Dynasties, his heart collapsed. When Yang Xuan learned that those time travelers had only one goal, which was to overthrow the Sui Dynasty he wanted to protect, his face was ferocious. When the generous system rewards were obtained, Yang Xuan just wanted to beat up the system. Why are the heroes summoned by others either Xiang Yu, Liu Bang, or the Frost Dragon? Why is it my turn to be here with Li Shishi, Gao Qiu, Tinker Bell, and Bald Qiang? After all, I am also the prince of Sui Dynasty, the big BOOS among many time travelers! You want me to lead a group of old men to defend the world surrounded by heroes? It seems that Lao Liu also has the benefits of Lao Liu, doesn't it? ! Now, the "Guardian Sui Dynasty" copy officially begins, with a "nightmare level" difficulty!