Lee Na Yeon is made an orphan when chaebol heiress Park Yu Gyeong causes the death of her mother, Lee Yu Nae, in a traffic accident. Yu Nae and Yu Gyeong had been rivals in love for the same man, Jang Gyeong Wan, with Yu Gyeong ensnaring him into marriage by claiming the child she is carrying is his. Jang attempts to make amends for abandoning his college sweetheart by trying to read moregive the orphaned Nayeon a home, to the anger of Yu Gyeong and the jealousy of his daughter Se Jin. When Na Yeon discovers evidence that her mother's death may be more than an accident, she forgoes the chance of a life of wealth and privilege for an orphanage. Taken in by the widow of the man who ran down her mother, Na Yeon grows up alongside Tae Jun, an impoverished but driven and academically brilliant young man who becomes the love of her life. However, he dumps her for his own success and goes with Se Jin.
Do Hee is Na Yeon’s twin sister. They have been separated since Do Hee was adopted by a wealthy couple when she was an infant. Do Hee now works as a reporter for a weekly magazine. For a story, Do Hee investigates into the background of Tae Joon. She discovers that she has a twin sister and Na Yeon was dumped by Tae Joon. Do Hee also learns that Tae Joon's mother got Na Yeon hospitalized at a psychiatric hospital. Do Hee visits Na Yeon at the hospital, but a fire engulfs the hospital and Do Hee dies. Na Yeon then takes the identity of her twin sister.