该剧并不是写给青少年的校园剧，而是写给我们大家的职场剧，和以往的校园剧从学校外面窥探学校和老师的方式不同，将直击校园内部的我们不熟悉的露骨真相。 徐玄振在剧中饰演私立学校临时老师高荷娜，作为没有资历的菜鸟老师，她进入的却是以教学出色闻名的大峙洞私立高中，被大家认为是空降兵和说谎精，就这样踏出了社会生活的第一步。 罗美兰饰演学校升学部部长朴成顺。她在学生面前是技高于人的“疯狗”，是典型女强人系列的“工作狂”。她是大峙洞学校的入学负责人。
金仁河（李秉宪 饰）从小就过着漂泊不定朝不保夕的动荡生活，他所结识的朋友，不是社会地位底下的小混混就是为人所不齿的卖身女，然而，金仁河本性善良又讲义气，深得朋友们的喜爱和信赖。一场意外中，金仁河锒铛入狱，在狱中，他不改本性，又结交了一群生死相依的朋友们。 出狱后，想要金盆洗手的金仁河却被迫重新坐上的赌桌，尽管赢得了赌局，却也弄得身败名裂，不得不隐姓埋名，东躲西藏。之后，金仁河被黑手党老大看重，加入了黑道，过了一段腥风血雨的日子。离开了黑道，金仁河重新回到了赌坛，这一次，他潜心深造，闭关修炼，终于成为了一代赌圣，而他和青梅竹马秀娟（宋慧乔 饰）之间的恋情，亦在风雨飘摇之中修成了正果。
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…
