tvN's apocalyptic thriller drama "Happiness," starring Han Hyo Joo, Park Hyung Sik and Jo Woo Jin, is generating a lot of response and positive feedback.

"Happiness" depicts the story of Yoon Sae Bom (Han Hyo Joo), Jung Yi Hyun (Park Hyung Sik) and Han Tae Seok (Jo Woo Jin) who work together to determine the cause of the new infectious disease that brings anxiety and fear in their lives.

3 Mysteries to Unravel in KDrama 'Happiness'

Kdrama "Happiness" quickly stole the viewers attention with its story and amazing casting. The storyline is just as amazing as the acting performances Han Hyo Joo, Park Hyung Sik and Jo Woo Jin showed in the first two episodes of the drama.

Ahead of the "Happiness" Episode 3 release, the production team of released three mysteries to look out for and solve as the drama progresses.

The Origin of the Threatening Infectious Disease

The life-threatening infectious disease comes with an intense aggression. It develops and spreads continuously, from one person to another.

Although there is a drug that helped to stop the virus, the severe side effects were proven to be more excruciating.

The Armed Medical Command Chief Han Tae Seok's said, "Just because you feel fine today doesn't mean you'll live tomorrow."

It raises doubts whether there would be a problem suddenly. The drugs that were to cure the disease were recovered and are secretly being illegally distributed in the black market.

Attention is focused on whether the unidentified drugs are the cause of the new infectious disease.

Han Tae Seok's True Identity Behind His Mask

Armed Medical Command Han Tae Seok is still a mystery to everyone. Although he calmly solves the novel infection situation, he confuses many with his callous personality.

His questionable actions - he only watched Yoon Sae Bom do something he knew dangerous and he didn't hesitate to use violent methods in certain situations-causes suspicion.

Before becoming the person in charge of the cure to the new infectious disease, Han Tae Seok was a pharmaceutical company's competitiveness and weapon, but he was pulled out from the team after an assault case.

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The reason why he returned to the military and took charge of the new infectious disease, as well as his true identity on whether he is good or evil remains a mystery.

Yoon Sae Bom's One of a Kind Case

Although the route of the infection is limited, as it is transmitted through scratching and biting, there is no exact cause in the disease pattern. Apart from that, there's no cure.

The public could only do so much, isolating and slowing the transmitting of the virus. In this situation, Yoon Sae Bom is a special case.

The tactical detective suffered from a wound on the back of her hand while trying to suppress an infected junior.

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She experienced no abnormalities other than the wound not healing quite well, surprising everyone.

This occurrence is also watched over by Han Tae Seok, where Yoon Sae Bom becomes the subject of his observation.

Questions are darted to Yoon Sae Bom as to why she seems immune to the virus and how she will be safe from the new virus outbreak until the end.

On the other hand, the much awaited apocalyptic drama "Happiness" third episode is slated to air on tvN on Friday, November 12 at 10:40 p.m. KST.

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Written by Elijah Mully.