Penthouse tells the story of wealthy families living in Hera Palace and their children at Cheong-ah Arts School.
Shim Su-ryeon (Lee Ji-ah) is an elegant, wealthy woman who has a tragic past. Her husband is Joo Dan-tae (Uhm Ki-joon), a successful businessman. She later learns that he is hiding a secret from her.
Oh Yoon-hee (Eugene) comes from a humble family background. She has had bad blood with Cheon Seo-jin (Kim So-yeon), a famous soprano whose father is the head of Cheong-ah Arts School, since high school. They get involved in a love triangle relationship with Ha Yoon-cheol (Yoon Jong-hoon).
All of them have grand ambitions and desires for their children and would do anything for them. However, their lives begin to crumble as a young mysterious girl named Min Seol-ah (Jo Soo-min) falls to her death during a party at Hera Palace. While the Hera Palace residents try to cover up the fact that she died on the premises, they cannot help but suspect each other in the murder.
Penthouse 2 focuses on Shim Su-ryeon's secrets and the aftermath of her death, Oh Yoon-hee's revenge, Cheon Seo-jin's downfall, and the Hera Palace kids who want to be the best and win the grand award at the Cheong-ah Arts Festival.
After successfully framing Oh Yoon-hee for murder, Cheon Seo-jin and Joo Dan-tae decided to get married. Their engagement party is interrupted by Oh Yoon-hee and Ha Yoon-cheol, who have just come back from the United States. As the secrets unveil, the relationships among the people at Hera Palace are entangled, yet another mysterious figure appears and confronts them.
Penthouse 3 focuses on the residents of Hera Palace after their trials and their kids who prepare themselves to take the college entrance examination.
Just when Shim Su-Ryeon, who faked her death in Season 1, thinks she can finally live happily, Logan Lee (Park Eun-seok) dies right before her eyes. Meanwhile, the Hera Palace residents get out of prison and attempt to get their lives back together. This starts the final lap of greed, corruption, injustice and redemption.
The production cost of this series is 32.7 billion won, 670 million won per episode (approximate). The series started its planning and preparation in September 2019.
The first season was extended by one episode to enable the series to end on a Tuesday.
On November 24, 2020, the series was officially renewed for a second and third season of twelve episodes each. It was also announced that the final seasons would air on the Friday–Saturday time slot compared to the first season previously aired on Monday–Tuesday time slot.
Reception
Season 1
According to the Good Data Corporation which measures drama popularity according to media trends, The Penthouse: War in Life topped the list with 27.82% surge in media mention in the second week of December. In the following week it led with a 35% surge in media mentions.
