Tiffany was so sure that she will marry her long time girlfriend Jessica at the age of 25 years old; until she caught her cheating with another woman. Now a 30 years old gun-shy-at-dating office woman, she tries to seek revenge on her cheating ex by signing a contract on a dating agency. There she meets Kim Taeyeon, the top free-lancer at the said agency. Will she get her revenge successfully or will she get something more?