Another Life, Another You

It's about a supernatural being falling in love with a mortal. Many years and generations have passed yet he still can't have the girl that he loved for so many generations. The girl felt the same so lucky enough to be reincarnated countless generations cause she never gave up on him either. She may be in a different body but her feelings never change. But being reincarnated many times never changed their fate, they always end up saying goodbye.