●I watched Penthouse when it finished and damn it was HeadBanging. But I found this interview now and am glad I found it now. My illusion of seeing them as bad characters would break cause all the actors are friendly among themselves so it would be a bummer if I watched this while watching Penthouse. All the actors are really different from the characters they portrayed. So I would suggest watching this if you have already watched the 3 seasons.
If you haven't watched this interview might ruin the tension, anxiety, and pain you have toward the drama.

●The Interview was all about discussing characters, and popular scenes in a fun way and the hardship they faced up during shooting. Its also revealed how they were curious about what was going to happen in the next episode. I was a bit sad that the Youngsters were not involved in the interview as much as the adults, so maybe the next season's Interview.

●Felt like adding this from the discussion cause the way it makes sense.
Why Penthouse was a massive success?
Park Eun Seok - cause Not everyone just toiled hard but also because everyone was a great lead role and also an amazing supporting character. I think thats what brought the drama great success. It felt like the main character changed with every episode and they all have a solid storyline. They were all main characters and sub-character. There were no plot holes.