Jiang Ye transmigrates into a chaotic age where the world is in turmoil and human lives are worth less than grass. He spends half his life struggling in poverty while guarding a martial arts school, only to unlock a heaven-defying comprehension system in his old age. Just when he thinks he will simply spend the rest of his days in obscurity, the Don't Look Down on an Old Man for Being Poor System awakens! Gaining one year of martial arts power with every passing day, he secretly masters Dark Force and Transforming Force through the health-preserving Five-Animal Fist. Others see him merely as a frail old gatekeeper, allowing the younger generation to insult him and powerful clans to scheme against him. Little do they know that behind the serial murders in Anxi County and the crisis threatening the prefectural city, he is secretly taking action to protect his loved ones and friends!