PK is murderous, that is to say, if you kill someone, you have to hang a knife. Most people are joking. If you don't really kill people, go to their wedding and bless them in a down-to-earth way. People who fight in it are sure to attract others' disgust. Tianlong's system sometimes has bugs. PK sometimes kills people and doesn't hang up the knife. Even the dead can get up directly from where they were. When I kill an enemy, I will get up from the same place indefinitely and not kill until I get off the assembly line.