A gold coin was like a time bomb that would cause a huge change in the protagonist's life once it was triggered. The protagonist of the story was called Zhang Lin, a young girl. She was born in an ordinary family. Her family was not rich, but her parents had always encouraged her to study hard and have a good future. Zhang Lin had been very diligent since she was young. She would wake up every morning to study and revise seriously at night. Her good performance in school was often praised by the teachers and envied by her classmates. However, fate played a cruel joke on her. Zhang Lin lost her best friend in an accident. She felt as if her heart was being cut by a knife, and her entire life had fallen into darkness. Zhang Lin fell into deep despair after losing her friend. She started to become more solitary and didn't communicate with others or study hard anymore. However, her life was not over. One day, she met a stranger on the street who handed her a gold coin. Zhang Lin was very surprised and did not know why the other party would give her gold coins. The other party told her that gold coins were a precious resource that could be used to exchange for the most important thing in life. If the other party was willing to exchange gold coins for her life, she could accept it. Zhang Lin was shocked and delighted. She felt that she had new hope. She began to pull herself together and study hard again. At the same time, she began to pay attention to the world around her. After the exchange, Zhang Lin obtained a new life with more knowledge and skills. She became more mature and confident, and she made more friends. She also began to think about her own life. She realized that she should not only live for her family and her studies. She wanted to create a better life for herself and more people, and she wanted to contribute to society. Thus, Zhang Lin began her own journey of starting a business. She used her knowledge and skills to start a successful business to provide help and services to more people. One gold coin changed Zhang Lin's life and made her stronger and more confident. She believed that as long as she had hope, she would be able to create a beautiful future.