The underworld is the sharpest blade in the world. Jianghu values humanity, while gangsters value profit; Jianghu values "righteousness," while gangsters value "cruelty." The two are in the same gray area: Jianghu weaves human feelings into a web, and the underworld twists violence into ropes; Jianghu uses face to make peace, while the underworld uses gunfire to clear the way. A secret code in a teahouse or a smuggling boat on the pier may contain both "rules of the rivers and lakes" and "laws of the underworld" at the same time. Outside the temple, they together constitute the evil side of people's hearts that has persisted for thousands of years: loose on the surface but strict on the inside; not only about brotherhood, but also about the division of territory; it is possible to draw a sword to help when there is an injustice, or it is possible to spill blood for a few inches of profit.
