What does it mean that the disaster of blood-stained bell tower gave birth to big brother?

Blood-stained bell tower disaster education eldest brother refers to the skill effect of the housekeeper in the disaster education version. The blood-stained bell tower is an officially recommended version suitable for newcomers. The housekeeper, the only outsider who can prove his identity, can become the highest-ranking person in the audience with high probability of success and lead the good people to victory. The housekeeper can recognize a big brother every night to identify the situation. Bloody Bell Tower is an identity reasoning game, which is divided into two camps: good and evil.