Joo Eun-hye always lived under pressure to be 'obedient' in a strict wealthy family. She seemed to be living an enviable life according to her family's wishes, but after just 2 years of marriage, she witnesses her husband's affair. Eun-hye, who confronted her husband, hears that this marriage was not love but a 'transaction'. Afterwards, she meets attractive bartender Lee Yuri at a bar she frequently visited. To him, who lives by forming secret relationships with wealthy women and receiving pocket money, she impulsively proposes a 'one-night stand'... "Are you really going to cheat with me? I'm expensive."