Celine works as the department head in a large company. The woman, barely in her mid-twenties, is assigned a new personal assistant: Lena, the trainee who is only a few years younger—and happens to be the granddaughter of the company's CEO.
Right from her first day on the job, the newcomer turns the office upside down and puts her direct superior, Celine, in embarrassing situations. But this is only the beginning of an almost unbelievable transformation in the department head's life. From now on, she must serve as the trainee's slave and is given an entirely new role within the company.