Human Skin Art

I am the owner of a tattoo shop and I have a unique skill called yin-yang embroidery. When I was learning this skill, my master once gave me three rules: people who lick blood from the edge of a knife should not get tattoos, people who commit adultery and evil should not get tattoos, and people who are heinous should not get tattoos. I have always followed his instructions, but everything changed the moment Niu Dazhu broke into my shop!