It's not a cat, it's a goblin?...

Grim reapers, well, their job is to drag people away when they die... You only call their name when they're dead. If you carelessly call the name of a living person, you'll die... The male lead doesn't know and is bewildered again. But... I thought it was a cat that came into the hospital room.... They say it's a goblin... What kind of situation is this??????