Regarding Korean entertainment novels with IU (Lee Ji-eun) as the protagonist, the following are some recommended works:

1. "The Prosperity of Korean Entertainment with You": This novel tells the story of the encounter between the protagonist and IU The final romantic love story.

2. "Korean Entertainment: Otaku Artist": This book takes IU as the protagonist and describes her growth story in the entertainment industry.

3. "Cool Korea": ??The novel tells the story of the protagonist and IU's experience working together in the Korean entertainment industry.

4. "My Uncle": This novel takes IU as the protagonist and tells a story full of warmth and growth.

5. "Hotel Del Luna": The novel tells the story between the hotel manager played by IU and the mysterious guest.

6. "4AM": A book with IU as the protagonist, describing her mental journey during the music creation process.

7. "Teacher": The novel tells the romantic story between a teacher played by IU and a student.

8. "Twenty-Three": Using IU's growth experience as a clue, it tells the story of the struggle of a young artist.

9. "Knee": This work features IU as the protagonist and tells a touching love story.

10. "Good Days": This book is based on IU's acting career and describes the story between her and her fans.

The above are the top ten Korean entertainment novels with IU as the protagonist. These novels have high ratings on the Internet, the storylines are attractive, and they can satisfy readers' love and curiosity about IU. Please note that the ranking of these novels is not absolute and may vary based on personal preferences and online reviews.