Here are some recommendations for modern romance novels with an age difference between the female protagonist and the male protagonist:
1. "你別撒嬌了" by 甜醋魚: This sweet and heartwarming novel features a couple with a 9-year age difference. The male protagonist initially doesn't understand love but later pursues it.
2. "風里有你的聲音" by 淡櫻: This novel tells the story of a sister-brother romance with a 5-year age difference. The female protagonist, a beautiful and talented ice skater, gradually captures the male protagonist's heart.
3. "小愛情" by 西子一笑: In this novel, the male and female protagonists have a 10-year age difference. It portrays a warm and ordinary daily life romance without major ups and downs.
4. "甜蜜蜜" by 倪多喜: This novel features a cute and deep love story between a young girl and a passionate CEO. The age difference between them is around 10 years.
Please note that these recommendations are based on the provided search results and may not represent an exhaustive list.