I am not used to give 10 stars to dramas about viruses or zombie because most of them are not much different from one another. But let me say that this one surprised me in any possible way. The acting was superb, they made me feel like I was actually living in the building and the people that got the virus were immaculate in their acting. I felt really anxious and especially in the last few episodes I felt like I stopped breathing for ho much I was invested in the story. The perfect comeback for our Hyunsik.