I loved it,i think it matters a lot that i went in with the "right" mentality to even name it so as it was a better experience going into it without having the high expectations of a webtoon lover as i knew the story more or less and over the years i've read here and there but wasn't invested so even the changes or so didn't effect me that much so those 10h or so went by so fast(i didn't believe i would binge it staying all night till 10am heh,another point to me) and so many emotions,especially with the ones who died as to be fair i cared the most about Jae-heon,really wanted him to survive and get out with Ji-soo…Song Kang was amazing,i totally rooted for him,think it's his best role to date and for me he delivered it,i felt so much sadness and anger for his backstory as his act of kindness was what turned his life in a living hell and other characters backstory were paintful as well…Another great point was their woman representation as the women were mostly the ones taking the main stage and front line when most of the guys(not or main 4)were trying to hide(like when they caught the spider monster),overcoming their fear faster and joing hands to protect themselves, something fresh as we usually always see the men in kdramas being the brave etc ones…I was somehow frustrated that the ones who died deserved to live but life is unfair and it says nowhere that good brave guys end up surviving and thegreedy self centered ones don't...Another great point was the whole atmosphere and the lack of information our group had access as I think part of the major fear aside from well,the monsters at each corner was that no one knew much of anything and maybe that was intended...Of course getting the full straight answers rather than small hints would have been great(i actually don't mind) but taking into context the whole story it made sense that no one knew,at least the general public making it all the more scary...
A great cast indeed and Lee Shi young's just WOW,aside from already a great actress she is body goals!
Hope we'll really get a second season as i really would want to see them explore the world and monsters outside of the complex building as they already have in their hands a rich world worthy of in deep and complex view…
The OST was also fantastic and my personal favorites were Tears of Sweet Home by Gae Mi, Park Junghwan & 4 Strings of Sweet Home by Gae Mi.

Recomand it very much!