Yi Jung is a very cold-hearted man. He is the heir to the Shinhwa Group, but doesn't want to be. For this reason, he shuts people out and takes his anger out on them, even if they did nothing wrong. Ga Eul is very kind-hearted - always helping people every chance she gets. Unfortunately, her family is very poor, and she has four part-time jobs already. In addition, she's always volunteering at shelters. Now, she is starting her fifth part time job as Yi Jung's house maid. Working with him is going to be stressful. She tries to teach him manners and how to be a better person, but in the process, they start having feelings for each other. What will happen between Yi Jung and Ga Eul? Also, what might happen when Ga Eul's ex-boyfriend returns?