This is about a girl named Yumi, niece of Lee Soo Man who is going to have her  vacation in Seoul.
She's a childish weird , kind of a spoiled girl, an attitude no one can stand.
Though Yumi wanted to be alone, Donghae was assigned to be the tour guide, dance instructor and ROOMMATE 
of Yumi as he was the most trusted guy in the company.

Will Donghae be able to stand her attitude? "