The peaceful life of Teacher Pobmek, a strict-looking primary school teacher who doesn't get along well with children, is about to be turned upside down when his cheerful boyfriend, Teacher Solar, gets into an accident that causes his mind to reset to that of a seven-year-old in an adult body every other day! Things get even more chaotic when Teacher Jee shows up as a new passionate and well-rounded primary school teacher, making his childhood friend Pobmek pale in comparison, so much so that Teacher Sodchuen, the acting principal, can't help but worry about the future of Teacher Pobmek's career and love life.  Will this love end in complete disaster, or will it become the warmest lesson of a teacher's life?