This story is all about a girl named Chou Tzuyu and a boy named Kim Taehyung. The both of them are so close since childhood but one day Taehyung left Tzuyu with a promise that he will married her in the future if they well meet again someday. But what more cause pain is Tzuyu had a accident she's having an amnesia but little by little she recovered from illness and remember everything but except about her childhood bestfriend. Well they met each other? Well they getting to know more? Well Tzuyu remember the past?