Coffee prince? I'm not sure if it was a mom or granny in-law, but as far as I remember she was quite nice.
Fated to love you - granny in-law, but since the main guy didn't have a mother, she was a mother figure.
Full House - there is a korean version, but I liked the thai one so much better
Marriage, Not Dating - okay, I wasn't sure whether to recommend this or not, because the mom was kind of a bitch at first, but as the drama goes by you see why she is like that, she changes a bit and you understand, that she is really likeable.