Don't know what the hype is about? It's just another zombie movie with zombies running amok. Probably the 2 differences that one could be excited by are
1) The zombies run fast
2) The movie is in Korean
Apart from these 2 distinct features I couldn't find one part which stood out as a feature that would make me recommend this to anyone.
*SPOILER AHEAD*
They just show the infection (which starts randomly) and shows survival (which is mostly running/hiding).
That's it. Nothing more nothing less.