Once the match has been made, it is time for the bridegroom to demonstrate that he and his family are worthy of the bride's family in the form of wedding gifts and a marriage letter (proposal). The bridegroom sends ha-am, a special box in which valuables such as gold, jewelry (an engagement ring, for instance) and wedding silks are held, to the bride's home. This box is to arrive by the evening before the wedding, and is usually delivered in a boisterous fashion by friends of the bridegroom. As the friends approach the bride's family home, they begin to shout, "Buy the ha-am! Buy the ha-am!" If everything is acceptable, the father of the bride accepts the box and pays the bridegroom for it. Of course, this is often a playful ritual today, but in the past, haggling over a wedding price could be very serious business.
Although now weddings will take place in a church or other more public location, traditionally, the wedding took place in the bride's home. Before the ceremony, the groom travels to the bride's house amongst a parade-like atmosphere (ch'inyoung). He brings with him the "wild goose father" who offers a goose (a wooden one today, although it used to be a live one) to the bride's mother (jeonanrye). The goose symbolizes an eternal bond, for geese mate for life.
Source : http://www.suite101.com/article.cfm/korean_culture/34311