Despite her lack of wealth, Seo Yeon is a well-known woman for her warm heart. One day, she learns that the man she calls her father, Kang Baek San, turns out to be her biological parents' sworn enemy. Tae Poong is Baek San's eldest son. Ever since the death of his younger sister, he spends time in the US while having conflicts with his father. San Deul is a gentleman who works hard at LeBlanc to repay Baek San's kindness. Although Tae Poong's sister Ba Da shows affection toward San Deul, he still has feelings for his first love, Ba Ram. But as he meets Seo Yeon, he feels a warm breeze in his heart. With the truth uncovered, Seo Yeon's vengeance will begin.