年幼的徐俊英从小与在美军基地村经营酒廊的母亲相依为命，孤单而寂寞，唯一的乐趣是躲在属于自己的秘密基地创作歌曲。一日，俊英遇见了夜总会一名新舞台歌手的女儿朴慧仁。双目失明的慧仁那双清澈的眼睛和温暖的笑颜，都让俊英怦然心动，俊英总是默默地守在她的左右。 正当俊英（权相宇饰）成长为英俊少年时，慧仁（金喜善饰）却被姑妈带走前往汉城，俊英也被汉城的亲生父亲改名为车俊奎，开始了新的人生。在新学校里，俊英与朋友李健宇（延政勋饰）结下了深厚的友谊。几经辗转，俊英终于与慧仁命运般地重逢，而此刻慧仁又将被继父带往美国，两人再次分别。来到美国留学的健宇偶然间遇见了仿佛天使般的慧仁，也深深地爱上了她。
When high school teacher Na Aejoon shows up for work on an ordinary day, he never expects to bump into his favorite celebrity in the hallway. But when his school becomes a filming location for a show starring Choi Siyeol, his bias from the idol group A-One, that's exactly what happens! If that's not enough to give a fanboy a heart attack, Siyeol takes an interest in Aejoon and asks him to join the show as his "co-teacher." Desperate to keep his fan life a secret, Aejoon is forced to put his acting skills to the test, and not just on camera. But as he spends more and more time with Siyeol, the deception becomes harder to keep up. Not to mention, he might not be the only one keeping secrets…
《噩梦老师》是一部学园神秘剧。剧中，某所高中日复一日的生活中，学生们在做梦的瞬间陷入了陌生而奇妙、无法抗拒的甜蜜诱惑。李旼赫饰演的高二学生尚宇很有好奇心和正义感，与好友誉林(金所炫 饰)一起，调查身份不明的噩梦老师河奉九(严基俊 饰)调任来校后发生的可疑事件。
