It all started with a poor man, Dae San, who spends his life in a local shopping district to sell clothes. Another man, Jun Hui, who looked identical to him, was rich and always investigating the truth behind his mother's death. Due to Jun Hui's illness he asked Dae San if he could switch lives with him for a day, so he can figure out the truth behind the death of his mother.
Yu Jin was a student studying in a Fashion Design school in Paris. Due to her fathers death she had to come back to Korea and help out her fathers company and her mothers sickness. Dae San helps her maintain her fathers store by switching lives with Jun Hui so he can obtain the money.