I have not heard of this drama before, but I was suddenly introduced to it my by friend and the big billboard in Hongdae, Seoul, which advertises this Netflix original. I loved it! And I believe that any horror/sci-fi genre lover will do so as well. To summarise, I feel like this drama was somewhere in between The Walking Dead and Attack on Titan. The CGI was throwing me off the first couple of episodes, but overall, it was a great effort for Korean production working alongside Netflix. Personally, I have not read the Webtoon, but apparently, it is a lot different story-wise, so I might just pick the Webtoon up. But the characters were immaculate and the character development was very strong. I grew really close to some actors and their roles, hopefully there is a season 2 to continue the story.