Maxed-Out Comprehension: From Shop Assistant to Immortal and Undying

After waking up, Yang Xiao transmigrates to another world and becomes the lowest-ranking slave-born waiter at the Vermilion Bird Tower in the Great Yan Dynasty, as insignificant as dust. Fortunately, he has maxed-out comprehension, but he lacks the meridians needed for cultivation and has utterly mediocre talent. In this world, immortals and demons coexist, nations contend for supremacy, and martial arts flourish. Yet the Vermilion Bird Tower, in the capital of the Great Yan Dynasty, is a rare sanctuary. Yang Xiao keeps a low profile at the Vermilion Bird Tower, hiding himself and his reputation. He spends sixty years honing a single sword, watching spring moons and autumn winds pass, and the tides rise and fall. Sixty years later, demons breach the city, and blood rains down from the heavens! As the Sixth Princess and the Great Yan Emperor kneel before the Vermilion Bird Tower, begging the hidden master to save them, with a million lives hanging in the balance, a sword shoots skyward from the Vermilion Bird Tower. Sword energy stretches a hundred thousand li. With one sword, the Nine Provinces turn cold!