The Missing White Dragon (2003)

Pa Ran found out that his father engaged him to Su Seon, in exchange for getting back the White Dragon, his family’s crest. In order to cancel the wedding, both Pa Ran and Su Seon have to find the crest and return it. As they try to find it, feelings emerged, and then they shared stories of their past. As it turns out, they had met each other as children, and Pa Ran had stolen the family crest as a promise to marry Su Seon. They returned the crest however, and the wedding is off.

Source: www.anisearch.com/manga/1516