Autumn Fairy tale (Autumn In My Heart)
The story begins during the teenage years of the two main characters: Yun Jun-suh (played by Choi Woo-hyeok) and Yun Eun-suh (played by Mun Geun-yeong). They both came from a rich industrialist's family and believed they are brother and sister by blood, until their parents discovered the truth after Eun-suh was involved in an automobile accident.
After blood tests were carried out by the doctor, it turns out that Eun-suh belongs to another parent, and Choi Shin-ae (played by Han Chae-yeong), belongs to the Yun family. At first, only the parents of Shin-ae and Eun-suh knew about this, but eventually, Shin-ae discovered the truth after she got into a fierce argument with her non-biological mother over gifts she received from Shin-ae's biological father. Eun-suh only discovered the truth after Shin-ae, now kicked out of the Choi residence, wants her biological parents to take her in. In the end, the two daughters were returned to their rightful parents. Eun-suh now lives with the Choi family, whose biological father have already died and her widowed mother operates a small food stall and lives in abject poverty.
Years went by, and in the duration, the entire Yun family went to the United States, where Jun-suh (now played by Song Seung-heon) returns to South Korea as a successful artist. He went back to the town he lived in, where he encountered his old friend, Han Tae-seok (played by Won Bin). They both resided in a hotel where Eun-suh (now played by Song Hye-gyo) works as a telephone receptionist. Tae-seok (who doesn't know about the entire brother and sister mixup that happened earlier) fell in love with Eun-suh and played games with her until she was terminated from the hotel she worked at. One day Eun-suh saw Joon-suh and followed him to the beach where he was with Yumi and Tae-sok and the two "siblings" finally met after ten years.
Both Eun-suh and Joon-suh pretended to have more of a sibling relationship in front of others at first but Shin-ae - angry at Eun-suh for taking away Tae-sok - exposed the two after she found a love letter Eun-suh had written for Joon-suh.
As a fight between Jun-suh and Tae-seok grows over their professed love for Eun-suh, she discovers she has leukemia (the same illness that took her biological father's life). She didn't tell anyone what happened until the disease was at a terminal stage. All hope was lost by now, and Eun-suh died as Jun-suh was carrying her around the beach for sightseeing.
Before Eun-suh died, she told Jun-seo not to follow her in death, and to continue living. However, Jun-suh, grief-stricken by the death of his lover and "sister", allowed himself to be struck by a truck (ironically the story starts with Eun-suh being struck by a truck), and he died shortly afterwards.

