What is the beauty of this couplet?

The first part: Run the lantern, the lantern will move and stop when it goes out.

Bottom line: flying tiger flag, flying tiger flag, tiger flag curling.

Legend has it that Wang Anshi went to Beijing to catch the exam when he was young, passed by Majia Town, met Miss Ma's foreign daughter-in-law, and married her with couplets. That young lady is not only handsome, but also familiar with the four books and five classics since she was a child. She knows all about piano, chess, calligraphy and painting. There is a lantern hanging at the gate, with a part on it:

Lights on, lights off, lights off.

The couplets are read backwards in the form of "running through the lantern", which is ingenious and neat. When Wang Anshi saw it, he exclaimed, "What a sentence." Because I was in a hurry to have an exam, I memorized this couplet in my heart.

He rushed to Beijing to take the exam and was the first to hand in the paper. Examiner Ouyang Xiu was unhappy when he saw Wang Anshi, a handsome young man. He pointed to the flying tiger flag fluttering in the wind in front of the hall and said:

Flying tiger flag, flying tiger flag, flag rolling tiger hiding.

Wang Anshi took Majiazhen's "Running Lantern" and responded casually. Hearing this, the examiner applauded.

Wang Anshi rushed to Majia's hometown after taking the exam, and was overjoyed to see the "Running Lantern" couplet hanging on the gate outside the city, so he responded with the examiner's "Flying Tiger Flag" couplet.

Seeing his extraordinary talent, Mr. Ma promised his wife and chose an auspicious day to get married in Mafu. When the couple visited heaven and earth, there was good news: Wang Daren won the first prize.

Wang Anshi's heart was filled with joy, and it was really "the wedding night was the first." While the aftertaste still exists, Thaksin wrote the word "Xi" on the red paper and posted it on the door (it is said that this is the origin of the big double happiness when China people got married later), and recited a poem:

Clever combination of couplets into double happiness songs,

Lantern flying tiger knotted silk.

The gold medal list of the wedding,

Little Deng Ke meets big Deng Ke.

A couplet made two happy events in Wang Anshi's life. Since then, Wang Anshi has been taught by Ouyang Xiu and assisted by Miss Ma. In the end, he became a famous politician, thinker and writer in the Song Dynasty, ranking among the eight masters in the Tang and Song Dynasties.