Wow. When I read the raw, I be like "WTF author, why you dont explain about the shrine thing? Instead you add random ghost and a little touch of that topic".
But when I read the TL, it turn out the Grandma still had little knowledge about that shrine. And that random ghost actually for developing relationship between FMC and grandma.
But I agree with people here, will Grandma will die for the sake of Fmc? Will FMC father will help her in the future?
This story became more more interesting actually.