Lin Feng, a delivery boy in an urban village, rides a broken battery car through the reinforced concrete jungle every day just to collect money for his mother's medical expenses. One time while delivering orders late at night, he bumped into a killer dressed in ancient costume in an unfinished building. When he was about to die, he picked up half a rusty ancient knife - this is the "remnant edge" that can awaken the soul of the knife in his body, but it will continue to erode his sanity, gradually confusing reality with the bloody illusion.
From then on, there were vegetable sellers practicing Qi hidden in the vegetable market, and the security guard of the office building turned out to be a retired martial artist. Lin Feng was forced to struggle between livelihood and transcendence: he used the soul of his sword to kill the debt collectors, but had to endure three days of headaches and auditory hallucinations afterwards; he relied on meager remuneration in exchange for training resources, and he had to beware of the coveting of hidden forces. He used the tenacity of the bottom to fight against the cost of power, and blazed a path of grassroots rise amidst the smoke and fire of the city and the bloodshed of high-level martial arts.
