Teacher Eun-sook (Choi Ji-woo) is very responsible and caring for her students. There is a problem student in her class named Young-hee. Young-hee often goes against the teacher and is not disciplined. Unable to bear it, Eun-sook asked Young-hee for her home phone number so that she could tell her parents about Young-hee. She never expected that this was the phone number of the president's (Ahn Sung-ki) home, and Young-hee was the president's daughter. The president then invited Eun-sook to his home, but the two people who met for the first time had differences on the issue of Young-hee and each held their own opinions. Unexpectedly, the president actually fell in love with Eun-sook and started pursuing her. The president hoped to pursue Eun-sook as a civilian, but his actual identity still brought him a lot of inconveniences, making this relationship difficult.