In an ancient town, there is a famous university, where the student Li Ming is a smart and diligent college student. He has excellent grades and a kind heart, and is deeply loved by his classmates and teachers.

The pharmacy in this town has a long history. It is one of the landmark buildings in this town. Li Ming usually goes to the drugstore to help in exchange for his tuition and living expenses. The owner of the drugstore is a kind old man with superb skills, but he often likes to tell some old stories mysteriously.

One day, a haggard man came to the drugstore. He looks as if he is very ill. The man claimed to be a farmer outside the town. He heard that the drugstore here has magical curative effect and came to ask for help. He said that all his family members have serious diseases and need a rare medicine to cure them.

Li Minghe drugstore owners sympathized with this man's experience, but they also realized that this drug is very dangerous, and if used improperly, it may bring more harm. The drugstore owner told the man that he could find this medicine for him, but it would take some time.

That night, there was silence in the drugstore. Li Ming was sorting out the medicine when he heard a strange sound coming from the corner of the drugstore. He walked over and saw a black figure moving in the corner. Li Ming's heart beat faster, and he had a bad feeling.

He tried to shout for help, but his voice became hoarse. He tried his best and finally shouted out, and the drugstore owner heard the voice. When they lit the corner, they found that the black figure had disappeared.

The drugstore owner told Li Ming that this black figure was actually an ancient ghost. He used to be the guardian of the drugstore, but he was trapped here because of a mistake made by the drugstore owner. The ghost wants to protect the drugstore and the residents of the town, but he needs a pure heart to release his power.

The owner of Li Minghe drugstore decided to help the ghost out of trouble. They began to study ancient literature and medicinal materials, trying to find a way to save ghosts. In the next few months, they kept trying and failed. However, they never gave up.

Finally, they found a possible way: make a medicine from a special herb and give it to ghosts. The owner of Li Minghe drugstore nervously made the medicine and took it to the corner of the drugstore.

When they spilled medicine on the ghost, the ghost gave off a strong light. As the light dissipates, so does the ghost. Li Minghe drugstore owners breathed a sigh of relief, and their efforts finally paid off.

Since then, pharmacies have become more prosperous and safe. Li Ming went on studying and got better grades. Moreover, the farmer's family has been treated and his body has gradually recovered. This story has become a legend in the town. People often talk about ghosts trapped in pharmacies and those brave college students and drugstore owners.