Dong Joo and Da Ji were once a couple who were married at 19 but they quickly divorced. Years passed, they both return to their old house and discover that their feelings for each other have been endured.

The drama will be about two men whose fates are crossed from the very first day that they were born. Both men were born in the same hospital. When he was a teenager, Lee Dong Chul witnessed the death of his father. From then on he promised to seek revenge on the man who caused his father's death, Shin Tae Hwan. But unbeknownst to everybody is the fact that Dong Chul's younger brother, Dong Wook, was switched at birth with Tae Hwan's son, Myung Hun. Dong Wook grows up to become a prosecutor and vows to help his brother seek revenge. But what happens when they find out that they're not brothers? What will Dong Chul do when he finds out that his real brother was raised by Shin Tae Hwan and that the brother that was beside him all these years is the son of his enemy?

After Seo Haneul (Sung Yuri) lost her mother in a fire, she was later adopted by a wealthy family and experienced a life of many twists and turns. Seo Gun's father had married an unwed mother, thus making Seo Haneul his sister in the eyes of the law. After their parents passed away, Seo Haneul was adopted by a wealthy chairman of a large organization who has also became a gangster. Upon using Haneul to extort money, Seo Gun and Haneul slowly fall in love with each other.