I know a killer who doesn't know who wants to kill him. He calls himself a killer. The killer is a very boring person and has few friends. I think he is pitiful and I occasionally say a few words to him. This killer actually wants to use a sword, but in fact, the knife he uses is not a kitchen knife and it is not a precious sword. The name of the sword is a precious sword. Let me write down a few things in the life of this boring killer.