tVN drama series "Happiness" has released a new behind-the-scenes video!

"Happiness" is a post-apocalyptic urban thriller set in the near future inside a socially stratified residential building. When a new infectious disease appears, the high-rise apartment is walled off, and the drama captures the terror, psychological fights, and desperate survival struggles that ensue.

In the drama, Han Hyo Joo plays Yoon Sae Bom, a tactical agent in the Seoul Police Special Operations Unit, and Park Hyung Sik plays detective Jung Yi Hyun, a former high school friend with emotions for her.

The actors give a firsthand tour of the drama set in this behind-the-scenes film. To begin, Han Hyo Joo speaks with child actress Song Ji Woo. "You're gorgeous," Song Ji Woo says, and Han Hyo Joo responds with "You're prettier." The caption reads, "You're both pretty, so please stop..."

Then Han Hyo Joo takes a closer look at the apartment of Yoon Sae Bom and Jung Yi Hyun. "It's more than you think it is," she says, before pointing out the specifics of Yoon Sae Bom and Jung Yi Hyun's fictitious living arrangement. "Even if we live together, we have different [things]," Han Hyo Joo explains, pointing to the small refrigerator and stating, "That's Yi Hyun's fridge." She then points to the larger refrigerator and says, "This is Sae Bom's." She opens it but soon closes it, saying, "It's a mess in there."

The next person to provide a tour of the set is Park Hyung Sik. He begins by showing a glimpse of the stairwell that Yoon Sae Bom and Jung Yi Hyun frequently utilize. He also demonstrates the size of the set by proudly spinning around to show the audience everything. "Hang on," he says as he comes to a halt. "I'm dizzy," Park Hyung Sik says as he enters the room from the motel scene and reveals that this is where Jung Yi Hyun discovered the Next medicine.

“Happiness,” which is on its last 2 episodes this week, airs every Friday and Saturday at 10:40 p.m. KST.