Black Knife Xia Ke Xing

I used to think about what martial arts is? In the end, is it the famous sword and fast horse that frees one's life, or is it the sword's flash and sword's shadow that causes bloodshed in the rivers and lakes? Later, when I started writing this story, I realized that the so-called martial arts is just the embodiment of chivalry in everyone's hearts in each story. Telling the stories I want to tell everyone who wants to hear them is my martial arts. A policeman armed with a black knife participates in an island escape. What will happen to his martial arts?