I picked up a mask on the ground at the beginning, and all the Good Guys Bride puppets are here. I suspect that spawning monsters has something to do with the value of the body.
If the items you pick up include jade, gold, or dragon balls, and you open the coffin, it is certain that you will encounter a ghost bride who will come to you to get married. The specific reason may be fishing and law enforcement, and you picked up her love token.
possible