his sister

i thought it was his mum and thats why he's raising his little sister

it's his sister. the little girl is his niece.

but why does Shira call him oppa then??

yeah? I thought so too, but then, when minhyeok got late to pick Shira, he's afraid that someone might took her, is that their dad???
omg this is kinda interesting

Maybe because he’s still quite young

I have a hunch that it's probably his uncle, and I think that “uncle” is the reason why Minhyeok hates it when someone touches him.

Minhyeok probably told her to. I mean, they're both young, and they only have each other. Minhyeok calls Shira's mother “Noona”