Woman's petty lie spins her life in an entirely unforeseen direction. She finds herself living someone else's life in this unpredictable tale.

Yoo Mi is the woman who tells a small lie and ends up living someone else's life. Hyun Joo is a woman who lives her life holding herself above everyone, treating them with neither kindness nor malice. She has a subtly tense relationship with Yoo Mi. Ji Hoon is Yoo Mi's husband who is ambitious and future-oriented.