Kim Kyung Sook, Kyung Ku and Kyung Min's father who was a widowed farmer married Keum Shil's mother when Keum Shil was six. The marriage was not a happy one and Keum Shil's mother continued her affair with Park Byung Sam, a rich landlord in the village, who was running for a seat in the Parliament.
Her body was discovered in the river after the election and Kyung Sook's father was wrongly accused of being the killer. He was tortured by the police into admission and later died in custody before trial. Park Byung Sam, who was in actual fact Keum Shil's real father, ordered his brother-in-law to adopt Keum Shil and gave him a job at the Intelligence Office in Seoul.
Kyung Sook had also moved to Seoul and worked hard to bring up her brothers. She vowed that she would clear her father's name and find the real killer. Park Byung Sam remained her no. 1 suspect even though she was in love with his son, Park Jong Kyu. It turned out that he wasn't the one but who was and why?