Sunshine is a poor, but cheerful Japanese girl who lives with her sacrificing, loving Grandmother. Despite the fact that they love her, her parents are extremely irresponsible con-men and have left her with a hundred-thousand yen debt. Her debtors finally give her an ultimatum - if she doesn't pay her parent's debt, she must go to jail for 300 days or become a maid for a rich family, using her wages to pay the debt. She agrees to become a maid, but before she can leave, Yaxin (the wealthy CEO of "A Lovera" a beauty-products company), falls through the roof of her straw-thatched shower. It turns out he was parachuting, but his balloon broke. After she threatens him with the wrath of an army of Japanese grandparents, he apologizes to her bathroom. Unfortunately for her, he turns out to be her new boss. Though at first he scorns her for dressing like a Grandma and she thinks he's a pampered, unreasonable child, as days pass they fall in love with each other.During this time, Gun Fei, who is Yaxin's childhood friend, is secretly plotting to destroy Yaxin. Though he has moments of uncertainty about what he's doing, he's spurred on by his dad's commands and his love for Angela - who loves Yaxin and does everything she can to be by his side. Despite all three being childhood friends, Angela never seemed to notice that Gun Fei has loved her ever since she began loving Yaxin. Despite her obvious affection, Yaxin is preoccupied with his work and doesn't spend time with her - causing her to react jealously when she realizes that he actually spends more time with Sunshine. As Sunshine continues to work for him, her infectious optimism begins to grow on Yaxin and he starts to fall in love with her.