Yu Mi-Ji and Yu Mi-Rae are identical-looking twins with diametrically opposed personalities. Mi-Ji, the younger, a promising former athlete, has turned her back on her sporting dreams to embrace a light, unattached life. In contrast, Mi-Rae, the eldest, embodies rigor: brilliant and methodical, she has followed a well-trodden path to a stable position in a public company.
One day, tired of their respective lives, they decide to change roles. This fool's game, as daring as it is risky, leads them into an experiment in which each discovers the other's flaws and aspirations.
Their scheme takes an unexpected turn with the arrival of Lee Ho-Su, an attractive lawyer with a troubled past, who hides his wounds behind a relaxed facade. His encounter with the two sisters will upset the balance, and force everyone to confront what they're running away from... to finally discover who they really are.
