The Penthouse is a place everyone dreams to be live in. Located in the wealthiest area of Seoul with the wealthiest residents, everyone desires to move higher up the building. Three moms in this drama unveil their secret desires to elevate their lives. Su Ryeon will do anything to take revenge on the adults that wrecked her child’s life. Seo Jin may have cultivated a successful career as a classical singer, but her daughter seems to lack in so many things unlike her. Yoon Hee refuses to inherit poverty and devastation to her daughter and tries everything she can to move into the Penthouse. This is a journey of the three moms pedaling down an unstoppable race fueled by greed and desire.

The residents of Hera Palace have become more wicked, and their secrets are about to be revealed. Seo Jin and Dan Tae eventually get rid of all the people who were in their way. They frame Yoon Hee as the murderer of Su Ryeon and even cover up the death of Seol A. The residents of Hera Palace believe that everything will go back to how it used to be. However, Yoon Hee breaks out of prison, and Eun Byeol knows the truth. We never know what will happen to them. Will they be able to protect their precious palace till the end?

The residents who've lost everything by falling into their own traps, plan another revenge for their comeback. Su Ryeon finally takes revenge on the residents of Hera Palace. They lost all of their money by investing in Cheonsoo District, and even worse, they are standing before the court for covering up Seol A’s death. Those greedy residents of Hera Palace who caught themselves in their own traps end up losing their fortunes, reputations, and everything they had, and Su Ryeon succeeds in getting her revenge on Dan Tae who tried to kill her. When Su Ryeon thought the nightmare is finally over, she witnesses Logan’s death right before her eyes. Who could have planned to murder Logan, and what will happen to the residents of Hera Palace next? Their desire for revenge is not over yet.