Autumn in My Heart (2000)

There were two girls who were born in October. They had same birthday and were raised in the same village and in the same class. One led a happy life with loving parents and a brother. Her name was Yoon Eun-seo. However, the other was raised by a single parent and was living in poverty. Her name was Choi Shin-ae. One day Eun-seo has a car accident and by a blood test it is found that Eun-seo and Shin-ae were swapped at birth. Girls were returned to their original places. Eun-seo's brother Yoon Joon-seo is especially confused and saddened by this. Some years later, Choi Eun-seo and Yoon Shin-ae bump into each other at hotel. Eun-seo is a poor worker and Shin-ae is a hotel manager. Meanwhile, Joon-seo has become an artist and has a fiancée. One day he's introduced to his friend's girlfriend, and she was his long-lost sister, Eun-seo. Now all the relationships start to twist around and Eun-seo and Joon-seo's sad love begins.