Perhaps the novel you're looking for is The Long Way Home. Although the entire novel was a fast-paced story, there was a chapter where the female protagonist traveled to an unknown dynasty and met a cunning mermaid and a gangster. I hope you like my recommendation.
I recommend "I am a Mermaid: Lord Ye Jue is a little cold" to you. This novel was written by the author, Yue Jiajia. It is a modern romance novel about wealthy families. The female protagonist was a cute mermaid who was saved by a vampire count. As the plot developed, the female and male leads were attracted to each other and loved each other. This novel also meets your requirements of the female lead transmigrating into a mermaid and the male lead being a prince. I hope you like this fairy's recommendation. Muah ~😗
I recommend "Rich Men's Favorite Marriage: Sir, Stop It". This is a fast-acting novel. The male lead is the CEO. It's a 1v1, a favorite genre. Welcome to read! I hope you like this fairy's recommendation. Muah ~😗
I'm the King of Hell in the Underworld. This book might meet your needs. The story of the male protagonist transmigrating into a female concubine, becoming an old mother and a master. I hope you like this fairy's recommendation. Muah ~😗
Yes, I recommend you the novel "The Supreme Crown Princess: Be More Restrained, Your Evildoer Highness." The story was about a man who had transmigrated to another world. After transmigrating, he became a princess and the crown princess. If you like novels with this theme, you can go and take a look. I hope you like this fairy's recommendation. Muah ~😗
Yes, I recommend the ancient romance novel,"The Age of the Female Primogenitor". The male protagonist is a cold male soul who transmigrated into the female world. I hope you like this fairy's recommendation. Muah ~😗
I recommend the novel " The Boss is a Fish." The male protagonist, Yao Yu, was a mermaid. After working out, he became very strong and eventually became the strongest man in the world. After working hard to establish his own brand, he became the world's largest sports brand. He acquired the company, and his annual income reached 30 billion US dollars. This novel combined fitness and business elements, allowing readers to feel the growth and success of the male protagonist. The story was compact and interesting. I hope you will like this novel.😘
I have one, I recommend it to you. It's called "The Encyclopedia of Surviving in Another World". The male protagonist is a mermaid! This book was a fantasy romance novel. In the year 4024, the end of the century finally arrived. The female protagonist, Kexin, came to this planet where humans and mermaids coexisted. Following Mother Wang's survival manual, he obtained a place to live. He had encountered many strange things in the other world, and the male lead was one of them. He was a gentle mermaid, and the love between him and the female lead was very sweet. I hope you like this fairy's recommendation. Muah ~😗
I recommend "Accidentally Becoming Master Shen's Favorite" to you. This novel about a modern wealthy family tells the story of the female protagonist who had to sell herself for money because of a series of bad experiences in her life. Then, she had a night of intimacy with the Empire's CEO, Shen Yu 'an, and thus began a wealthy relationship. The plot where the male lead was the leader of the underworld was also included. I hope you like this fairy's recommendation. Muah ~😗
I recommend a novel for you called " Wear It Quickly: The Vicious Female Supporting Character Begins to Be a Demon from the Chronicles ". The female protagonist is called Yu Zhu. She is a guardian system that transmigrated to different worlds to protect those who have their lives ruined by scum. In this novel, the female lead, Yu Zhu, had the character of a top-grade aunt in the era, a foodie in the entertainment industry, a bully tiger in the zoo, Long Aotian's mother who helped the bully, and so on. This novel contains sci-fi space and space-time travel elements. It meets your requirements for a non-CP female protagonist. I hope you like my recommendation.😗
I recommend "Quickly Get Through the System: A Guide to Being Charming" to you. This novel tells the story of a fair-skinned and beautiful female lead who was naturally popular and was found by the system to complete various guides. The target of each guide was a cold, heartless, and black-bellied male lead. I believe you will like this sweet novel. I hope you like this fairy's recommendation. Muah ~😗