The appeal of 'A Beautiful Affection' lies in its unique storyline. It has unexpected twists and turns that keep you on the edge of your seat. Plus, the characters have a lot of personality and you can't help but root for them.
I'm not sure specifically as there could be many novels with this title or related concept. It might be about different ways people show affection in a fictional story, perhaps romantic love, friendship love or family love shown through the characters' actions and relationships.