The bracelet symbolizes unity and common love for life.
Everyone sleeps together, which shows that they have a good relationship, dream together in the same bed and have a loving family relationship.
Zombies represent emotional numbness, indifference and rigidity.
Pulling a person away without a bracelet shows that if there is no family tie, he may lose himself and become a cold-blooded and lonely person like a zombie.
The turning white of the military coat indicates the change of image and state. White represents pale life and lifeless life.
You didn't have a bracelet at first, so grandma helped you. This is because grandma loves you very much, gives you a sense of security, has an emotional experience, and will not let you be affected by bad personality.