The story of a fling between Lee Joo-ah and Lee Joon-pyo, who meet as sellers and buyers at a used market. Lee Joo-ah meets Lee Joon-pyo to purchase a limited edition couple bracelet. She is placed in a situation where she witnesses her boyfriend's affair at the place of the deal. Lee Joon-pyo has experienced something similar, so he starts to care about Lee Joo-ah without realizing it.