一間單身公寓，四個完全不同的男與女，因緣際會共聚一堂。一開始他們互不認識，漸漸從敵對、猜忌走向友誼的建立；他們是如此的不同，然而有一條看不見的線將他們四人牢牢的繫在一起，無論如何都無法分開……
每個人都有一條別人不能碰、只屬於自己的安全毯，安全毯能夠帶來安慰，一旦失去它，人物性格逐漸扭曲，最後是走向毀滅還是得到救贖？
　
In an apartment, there are four bachelors and spinsters with entirely different characters. By chance, all of them gather in the same place. At first, they don’t know each other. Gradually, their relationship starts from being hostile, goes through being suspicious and jealous and finally builds up to their good friendship. They are so different. However, there is an invisible thread connecting four people together. Whatever happens, nothing can separate them….
Everyone has his own Security Blanket which nobody can touch. A Security Blanket can bring great comfort. However, once it is lost, each one’s character becomes distorted. Finally, do they work towards destruction or salvation?