The origin of the groom's official?

At the wedding, we newlyweds were called "the groom's official" and "the bride", but why was the groom called "the official"? It is because in the old society, on auspicious days, the groom personally took the sedan chair to the bride's house. ) Also known as "Xiao", it not only makes the groom wear official clothes without fame, but even if he meets the county grandfather, his official sedan chair will take a detour. Old Nanjing often said: "One hundred days for the people, one day for the official" is the result, and ordinary people can become addicted to the official on their wedding day. So the groom is also called the groom's official.