What do you mean by poisoning the clock tower with blood?

The rules of the game Bloodstained Bell Tower is a very interesting board game. Players will be divided into two camps: reasoning and argumentation to win the game. Poisoning the bloody bell tower is the rule of the game. At the beginning of the game, the storyteller will draw a circle with the same number of players on it. The survival mark has two colors to distinguish travelers from other players.