I honestly love this drama so much. idk why people hate it lol. I also don't know why they titled this happiness but I have a little idea about it. This drama is really good for me because on how they presented it to be somewhat realistic and engaging. There's a lot of annoying characters but I managed to watch it still AHHAHA. The cast really did a great job on their roles and my emotions through watching this was a roller coaster, excitement, happiness, anger, annoyance and many more. I love the couple's chemistry because on how it's so natural and just pure bliss and it gives me butterflies :D
The plot was really good and quite realistic on what causes these people to become zombies and go back to their normal form after sometime. I think that people may find this boring or cliche but for me, this is very good already lol. The storyline was presented in a good way and there acting was on point. I feel like I need a season 2 for this sooo bad cuz we barely had the couple's screen time T_T. The title.... idk 'bout this AAHHAHA. It's more like pain T-T
But I feel like they named this 'Happiness' because despite the difficulties that they had while trying to protect everybody in the apartment, they still had happiness being with each other. And finally, they achieved happiness in the end. I really recommend this drama. It's worth watching and you will never get bored.