A heart patient with a mechanical heart sounds very advance to me and at a point i have a sudden thought whether it will really work someday in the future?

A car accident ten years ago turned ML into a cold-hearted (like a lizard) person who always gets himself preparing for death as he understands that his mechanical heart will expired someday. He decided to live without love for the rest of his life until he met FL, who is a very optimistic girl who is very contrary to his character. FL claimed herself looks like a crow which is always deemed as bad luck until she met ML who turned away all the bad luck.

Nothing new on the story as when there's a point when ML give up on their relationship once he knows his hope to live like a normal person falls apart and his mechanical heart is near to lapse. This is always the part which I can't understand why whenever things like this happened, ML will forever keeps thing on his own and decided to end the relationship. ML will forever act cold as he no longer care or love the FL and make some stupid act to make the FL disappointed. The most heartache part in this drama is when FL misunderstand ML for signing the consent form to forgo their severely-ill adopted cat. The cat is a symbol of their love; the decision to forgo symbolized the end of his love to the FL.

In fact in the ending part for this drama, a sad ending is more ideal and realistic but this seems hardly seen in modern C-drama. Another thing to highlight on is where I understand that the ML is reluctant to have any kissing scene in any of his drama. This makes the kissing part of the love story looks stale, hope something can be improved on this.