Jinnie has been childhood best friends with Bang Yedam. They did everything together and shared each other’s secrets until one day she moved to Canada. She eventually lost contact with him. Ten years later, she transfers to YG Academy as a new English teacher and it turns out it was class 1-4, Bang Yedam’s class. As she makes it up with Bang Yedam, she falls in love with him all over again. But through their love comes consequences and a whole lot of danger.