Taeyeon got amnesia after a car accident. She was adopted by Mrs. Lee because Mrs. Lee got pity on her. She suddenly mets her uncle who owns a school and was enrolled in there. She meets baekhyun again but the thing is, is that he doesn't recognize her and she doesn't know him either. Will the pass bring back? Will she return her memory? Will they love each other again like what happened in THE PAST?