- Set around the luxury Penthouse Apartment with 100 floors.
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.
Lee Ji ah
Kim So yeon
Um Ki joon
Shim Eun kyung