i think the ending was really fitting. Both got punished by the heavens. Kang Min Ki lived 23 lives repenting what he did to the sisters. And once he had made peace he went to Ban Ji Eum. He was ready to accept whatever choice BJE was to make.
And Ban Ji Eum only remembered her 1st life in her 19th because her lesson was to learn letting go of people once they're gone, she had to let go of not only her sister but all the people she loved in her 19 lives. Ahh gosh this was so beautiful, i needed this drama :(