In the Name of Love, Faithful for a Lifetime

After the woman he loved dies of an illness and donates her heart to another girl, he is devastated. But he believes that his girl will live on in his heart in another way. He does everything he can to protect the girl who received the donated heart, simply because she has the heart of the person he once cared about most. But he never falls for her; he protects her from harm as if it were his duty.