Yerim is a 16 years old girl who lives with her school teachers, Ms. Irene, Ms. Jisoo, Ms. Jennie, Ms. Chaeyoung and Ms. Lisa in one home. Her teachers are like her mothers, taking care of her and disciplining her when she needs it. Yerim is a mischevious troublemaker both at school and home. Although Yerim is a such a naughty girl, her teachers love her to the moon and back and although her teachers are strict to her and punish her, she loves them until the world ends.