Haegeum's fiancé offers her an outrageous proposal... he wants them to each have one last steamy fling with other people before getting married. After her initial heartbreak and shock, she agrees, but for only one reason—revenge! She wants him to regret this selfish decision, and the best way to accomplish that is with a younger, sexier boyfriend. Luckily, the perfect guy just moved in next door. Sihoon is accomplished, handsome, and charming... but he's her younger brother's best friend. Can Haegeum get her revenge AND keep the guy?