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Su Yu, 25 years old, is a royal beauty, retired elite of the special forces, and owns an international security company with 2,000 employees in Shenzhen. Her parents are in charge of a low-key wealthy business empire with an annual revenue of over 200 billion. During a leisure trip to Shennongjia, she was secretly contacted by the mysterious 749 Bureau. With a non-staff invitation, she embarked on a journey of investigating unsolved UFO cases around the world at her own expense. Good and evil aliens have hidden themselves on the earth, and shocking secrets have been hidden for hundreds of years. Roswell, Area 51, crop circles... Behind each of these bizarre events, is it a well-intentioned visit from an alien civilization, or is it a long-planned invasion crisis? With a mortal body and top security capabilities, Su Yu travels around the world to find out the truth, just to protect the people of the earth and write an interstellar guardian legend!

Time travel to Li Ying, the deposed prince of the Tang Dynasty, who was trapped in a dead situation. Once he traveled to the Western Regions, he survived a desperate situation! While others compete for the throne, I abandon Chang'an and defend Anxi! Train the iron army, farm and reclaim wasteland, subdue powerful generals, and defeat Tubo! The Anshi Rebellion broke out, the Central Plains collapsed, and Chang'an was in danger! I led the Anxi iron cavalry out of Tongguan, swept away the rebels, and recreated the prosperous Tang Dynasty! Don't love the throne, don't remember past grudges, just be the gatekeeper of the Tang Dynasty! Guard the Western Regions, quell the Anshi Rebellion, guard thousands of miles of mountains and rivers, and preserve the prosperous Tang Dynasty!