I don't understand why did they complicated this kdrama instead they could have just remake/copied from the original story Miss Granny like what others are doing atleast their rating are way better even they remade their original movies then in kdramas.
I watched the old version first and after watching this one it felt like a Sequel to me as in the ending of the old version it was kept open for viewers then the movie but I believe we can consider this a adaptation as well as Sequel as well