What is Po's main story?

Po tells the story of Sun, a bookworm, who was overjoyed to see a beautiful woman Po at a temple fair. His soul followed him back to Po's house. Po is asleep, he is asleep, Po is up, and he is with him. Po was so scared that he sent someone to Sun's house to find out the situation. People who came back said that Sun Tzu Chu had only one breath left. Po said, if you can regain your human form, I will marry you. Sun Zichu was very happy. His soul returned to his old body and he woke up. But Po's parents don't want to. Po would rather die than marry Sun, so his parents agreed. After marriage, husband and wife love each other. One day, Sun's friends played a trick on Sun, gave him several extremely obscure questions for Sun to do, and lied to him that they bribed the examiner to get the test questions. Sun believes in them and takes them very seriously. As a result, these were the questions when he took the big exam. Sun became an official, but his life was thin and he died in a few years. Po was in great pain, hunger strike and dying. When Po woke up, he heard a sound in the coffin. When he opened it, Sun really woke up.

The relationship between Po and Sun was also touched.