What's the difference between wedding greetings and double happiness?

In the Song Dynasty, there was a lovely girl in Majiacun who was unmarried at the age of seventeen. This year was the year when the emperor selected talents. Mr. Ma wanted to recruit a knowledgeable man to be a son-in-law, so he hung a couplet outside the village gate, saying that whoever could write the next couplet would betroth his daughter to him. At that time, many passing juren failed to catch up. Wang Anshi's scientific research passed by here, and he couldn't think of the bottom line for a long time, so he kept it in mind.

In the examination room in Beijing, Wang Anshi handed in the first volume, and the examiner liked him very much, so he wrote a couplet of "Flying Tiger Flag, Flying Tiger Flag, Tiger Flag Hidden" for Wang Anshi. Wang Anshi immediately thought of Mr. Ma's couplet, and the examiner was very satisfied.

Wang Anshi passed Majia Village on his way home and found that no one answered the couplets. He had a brainwave and told the examiner the second link. Mr. Ma was very happy and chose a good day for his daughter to get married. On the wedding day, good news came. Wang Anshi won the gold medal, which was "Wedding Night, Be the First Time". He was overjoyed, double happiness. Wang Anshi wrote a big double happiness and posted it on the door to celebrate. Since then, the word has been handed down.

Jubilee means celebration and auspiciousness.