Saved a Princess from the Start, Then Pulled Out a System

Modern special forces soldier Zhao Feng transmigrates to the early Zhenguan era and becomes a down-and-out man barely scraping by in Chang'an. From the start, he stumbles upon Princess Changle falling into a lake. He saves her using modern first-aid knowledge, only to be arrested and thrown in prison as a hooligan. With his head about to roll, the “Ultimate Survival System” that has been bound to him for eighteen years finally activates!