Shim Su-Ryeon (Lee Ji-Ah) was born into wealth. She is now an elegant woman of the upper class and she is like the queen of the Penthouse Apartment. Her husband is Joo Dan-Tae (Uhm Ki-Joon). He is successful in business and real estate.
Cheon Seo-Jin (Kim So-Yeon) was born into a wealthy family. She is arrogant. Her husband is Ha Yoon-Cheol (Yoon Jong-Hoon). He is a chief surgeon at a general hospital and an ambitious man.
Oh Yoon-Hee (Eugene) comes from a poor family background. She works hard for her children's success. She wants to belong to the upper class for her children.