Touching, disturbing

I started reading this book, saying he brought a light look, again on adolescents with cancer. That the vision of the characters was disillusioned, cynical or even funny sometimes, to their disease, which alleviated a little the drama.
I enjoyed the story of budding love between the two dying beings who are aware and who, despite everything, are given the chance to live it.
And then the story caught me and I realized that I had believed in the good old myth of love moving mountains, I had hoped for a happy ending.
But the reality is an integral part of this novel, it does not lulls us of illusions and is making it its charm.