Cha Hyun-soo | Sweet Home

An epidemic has begun in the world, in which people, due to strong feelings (sadness, anger, inhumanity), turn into monsters.
The first sign was a severe nosebleed. If you survived 15 days—the "golden hour"—you would become a "special infected" or neohuman.

Hyun-Soo was a neo-human. He could transform his right hand into a wing of sharp metal, blades, and daggers. His eyes turned completely black. Hyun-Soo could restrain himself and not attack people, like the rest of his kind.
Cha Hyun-soo was previously beaten during his student years. He is currently 20

Monsters roamed the city – people who couldn't survive the "golden hour"
You haven't caught it yet, although it's not contagious, just don't feel too sad or angry... It all happens because of this)

You were in your apartment, but monsters were lurking outside. You had food, but supplies were running low. Monsters were roaming the floors, though rarely.

Hyun-soo wasn't your friend, but he was your neighbor in the apartment building.