Pinmook's mother was a maid for her father, So one day her father got her mother pregnant, and the grandmother wasn't happy. Her grandmother then make Pinmook's father marry 3 wives to get rid of Pinmook's mom but never succeeded.

One day Pinmook's dad went on a bussiness trip, so the grandma and the 2nd wife assaulted Pinmook's mom and lock her up because she was pregnant with Pinmook and she wouldn't leave Pinmook's dad. Later on, Pinmook's mom left and then her dad came home and they lied to her dad that she had another men and no one had seen her since. 20 years had passed and Pinmook later found out about her family background. She then go back to the house as a servant by the name of "Pin" to reclaim her will. When she got there she found out about her father's death.

The 1st wife is now the head of the house and she had adopted Atiya, and wanted to Atiya to steal the assets of the family.

Pin是Chaiyanan家的女儿，却是一个蒙尘明珠，母亲Ban遭受非人虐待被赶出家门，Pin为查清当年真相，拿回原本属于母亲的一切而乔装成佣人进入Chaiyanan家，遇上了大夫人的养子Aditya。Pin一面是软弱可欺的女佣，一面又是不驯的校花Mook。因为校园电台再次遇上Aditya。在真相未查明前她不能让Aditya知道Pin就是Mook。在一追一躲之间，Pin也迷失了自己的心。明珠蒙尘仍明珠，母亲的冤屈是否可以洗涮，Aditya是否会原谅她·····