韩志勋（李瑞镇 饰）是食品公司会长的小儿子，他为人冷漠而又自私，信奉金钱至上的人生信条，眼中只有利益，没有人情。韩志勋痛恨处处都胜过自己的哥哥，更厌恶赋予自己“私生子”身份的母亲，他想尽了一切方法，不择手段，只为了击垮哥哥，获得继承父亲公司的权利。 姜慧秀（金宥真 饰）和女儿过着相依为命的生活，虽然日子清苦，但母女两人相伴，终究还是苦中有乐，善良的姜慧秀也从未抱怨过命运的不公。某日，姜慧秀经医生诊断患上了绝症命不久矣，坚强的她第一次感受到了绝望的滋味，就在此时，韩志勋出现在了她的面前，以巨额的金钱为诱饵，让姜慧秀和自己假扮夫妻，迫于压力，姜慧秀同意了。
此剧讲述了在杀人预告里饰演患记忆丧失症的一个男人和饰演他的未婚妻，存在感为0的女秘书之间发生的甜蜜杀气腾腾的疯狂爱情故事，是一部在狗血人生里展开的两个男女的甜蜜故事。
他们不但是隔壁邻居，而且还看同一位心理医生，纵然两人话不投机，却总是无法避开对方。
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…
