* On a starting note:
You would wonder why I gave an overall score of 9 when I rated the story 7.5! My numbers don't add up because this work is just as complex.
* "Happiness" is a depressing apocalyptic take on the classic Search for Happiness, I thought it would be another survival story but it was so much more.
I would say the story is the weakest factor this drama has, while the acting, twists, and characters are one of the best I've seen taking into consideration it's a 12 episodes show.

* After the Ending note:
I feel dizzy.. like I know it's a 12 episodes drama but dang I wanted it to last longer.. guess the producers did everything they could to cook such a deep show in only 12 episodes.
Even with all the plotholes, I still rated this a solid 9/10 for the drama, characters, and development! It's been a while since I got this immersed on a show! I even was waiting for someone to jumpscare me until the very end of the credits ?? cuz I was already so traumatized over all the jumpscares.
My favorite part is how much you would see from each character and the development of many - be it for the bad or the good-! The twists were quite good too! The acting was superb that almost every character had its own light. I sobbed a few times and was fumming at others.
I liked that this time it wasn't poor people are good, rich people are bad, this time the drama adapted the reality approach that a person cannot be judged until you have lived with them!
People's true nature isn't something easily discovered nor judged. This is the core charm of Happiness for me.
And of course another charm was showing us what is the real HAPPINESS whithout mentioning it once in the drama!
This work kinda reminds me of webtoon I've read years ago called DeadDays, I can't remember the details but I totally get the dejavu.

* just wanted to end this saying that you will be left thinking and appreciating the Happiness you have in your life through the misery of HAPPINESS