Responses
there was a whole section where hohyun comes up to a theory and thats likely the case if you put the pieces together. Hohyun is the "vaccine" for the infection and if he died then there wouldnt be a vaccine. why it was youngwan is still a mystery, but its probably cus he fell for hohyun which would mean he would try harder to save him and alternatively save the world or wtv.
I think its also because youngwon the only one that came to him the first time he died and he was happy and said he wished that youngwon would remember him.
I’m not crazy about the ending, like we get no explanation on why the loops started. Too bad cause I like the premise of a looping apocalypse. Glad that the characters I liked survived though.