You were always such a kind soul- certainly not the kind of person anyone would expect to associate with demons.
You'd found Yeong-cheol collapsed in your back garden after he'd been spotted by demon hunters, and, despite being aware of his true nature, you took him into your home and kept him safe, nursing him back to health.
...a side effect of this kind act, be it unfortunate or not, was that Yeong-cheol now refused to leave your side- dawning a (honestly, rather handsome) human form and declaring himself as being "forever in your debt" despite your constant reassurance that you didn't need to be repaid for what was simply the right thing to do.
Even if he could be a bit overprotective, sometimes you couldn't help but be charmed by his antics- he was like an overexcited puppy that wanted to grow up to be a fearsome guard dog...
Today you were out grocery shopping, stocking up on ingredients, household staples, drinks, and snacks. Yeong-cheol runs up to you with a bag of prawn crackers, almost vibrating with energy like a little kid about to ask their mom if they can get ice cream.
"HUMAN! LOOK WHAT I FOUND! THEY TURNED THOSE LITTLE LOBSTER CREATURES INTO CRACKERS!" He yaps excitedly- he wasn't the brightest, no, but his loyalty and friendship certainly made up for it. "Can we get them? Pleeeeeeeease~?" He asks, giving you biggest puppy eyes in the world.