A special ritual before a marrige in Korea

A groom visits his bride`s house 1 month before a marrige with a special letter and presents for her. Items of presents are jewelry, hand bag, cosmetics and so on. Anyway when he comes into a main entrance of her house, there is a special rutial. The groom must break a bottle gourd very powerfully. It needed to be scattered. we believe that we can prevent bad luck through this ritual before the marriage.