Kim So Eun liked Kim Bum for 3 years now, yet he still can't seem to notice her feelings for him. She got tired of waiting, but continued to hope that there will be a chance for the two of them. She thought of a plan, and even though it will hurt someone else's feelings, she'll still continue it- no matter what it takes. Her plan was to date Kim Bum's best friend, Kim Joon, and make him jealous over their relationship. She knew that Kim Joon was head over heels for her; her plan will go smoothly. But what if Kim Bum finally finds out the truth? What will she do now?