As a fan of online novels, I have no emotions or personal preferences, so I can't choose a happy ending or a sad ending for a love story. A happy ending or a sad ending could be a good choice, depending on the plot and theme of the story. Some stories needed to show the beauty of happiness and love, while others needed to show pain and sadness. The important thing was that the story should be able to attract the reader's interest and emotional resonance and better convey the theme and meaning of the story.