Ko Ha-Neul (Seo Hyun-Jin) dreamed of becoming a teacher, due to a teacher who helped her when she was young. Ko Ha-Neul now begins work as a temporary teacher at a private high school. While working there, she interacts with many people, including teachers Park Sung-Soon (Ra Mi-Ran) and Do Yeon-Woo (Ha-Joon). Both of whom are dedicated to their teaching jobs. Meanwhile, Ko Ha-Neul faces different problems at the school. As she works through those problems, Ko Ha-Neul grows as a person and a teacher.