Bo Mi is 12 years old. She wants her own room so badly. Her sister, Un Joo, whom she shares the room with keeps sneaking a look at her diary. She studied really hard to get first place as her mom promised to get her own room if she did but her mom keeps denying the promise. So Bo Mi decides to marry her sister off!
She finds out that the manager of a construction company like her sister and does her best to help him. The manager ends up winning her heart and proposes to Un Joo. But she refuses his proposal. Bo Mi gets curious and tries to find out why she doesn't want to get married.
Main Cast: An Su Hyun, Lee Young Ah, Park Hae Mi, Jung Joon Won