Based on the provided search results, there are several recommendations for novels featuring male protagonists who are wealthy and hold the title of "世子" (heir to a noble family). Here are some options:
1. "豪門首席搶愛攻略" is a novel where the male protagonist is rich and powerful, attracting the attention of many women.
2. "世子妃穿越記" tells the story of a wealthy male protagonist, 郁王世子, and a beloved female protagonist, 顏清溪.
3. "紈绔世子妃" is a classic novel that revolves around the male protagonist, 容景, who is considered one of the perfect male gods in the ancient romance genre.
Please note that these recommendations are based on the limited information provided and may not fully meet your preferences.