tvN's new apocalyptic thriller drama "Happiness" shared fun behind-the-scenes photos which contain moments from its first and second episodes.

In contrast to the drama's tense and heart-stopping atmosphere, the ambiance on set of the drama is quite playful and full of energy.

Han Hyo Joo, Park Hyung Sik and More Display Playful Chemistry on Filming Set of 'Happiness'

The newly released behind-the-scenes photos, Park Hyung Sik, who plays detective Jung Yi Hyun, shows off his playful nature and undeniable chemistry with Lee Joon Hyuk, his partner and veteran police officer Kim Jung Kook.

Despite the playful ambiance on set, Park Hyung Sik still sees to it that he immersed himself in his acting role. In the second photo, although candid, he exudes a charismatic aura.

IN CASE YOU MISSED IT: Han Hyo Joo Becomes a Human Armament in New Thriller Kdrama With Park Hyung Sik + Shares Honest Thoughts in Choosing 'Happiness'

On the other hand, Han Hyo Joo, who plays the role of intelligent tactical detective Yoon Sae Bom, radiates strength and power as she readies herself for filming.

Even when the camera is not rolling, she works hard together with Lee Kyu Hyung, who plays her longtime partner Lee Seung Young. The two of them utilize their time reviewing their scripts and dialogues.

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Finally, veteran star Jo Woo Jin, the Armed Forces Medical Command head Han Tae Suk, shows off his hardworking nature on set. Even during rehearsals and breaks, the seasoned actor gives his best.

'Happiness' Production Team On Han Hyo Joo, Park Hyung Sik and Jo Woo Jin's Chemistry

Apart from the three main characters, the production unit of the apocalyptic thriller drama built a great friendship with the three veteran actors.

The production team of "Happiness" commented, "Han Hyo Joo, Park Hyung Sik and Jo Woo Jin's acting performances and chemistry are overwhelmingly great. The viewers will surely enjoy watching the drama showing off their charms that heighten the reality of the story."

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The unknown infectious disease threatens the people day by day. Han Hyo Joo, Park Hyung Sik and the rest of the cast of "Happiness" encourage everyone to support and anticipate the drama.

Moreover, tvN's new drama "Happiness" airs every Friday and Saturday at 10:40 p.m. KST on tvN. It is also available for worldwide streaming on iQIYI.

Watch the making of "Happiness" episodes one and two here:

ALSO READ: 'Happiness' Teaser: Han Hyo Joo, Park Hyung Sik and Jo Woo Jin Struggle to Keep Themselves Safe From Unknown Enemies

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Reported by Elijah Mully.