Which one of them recommended that the female and male leads were all good underworld novels? Were they all very strong?

Based on the information provided, I am unable to determine the name of this novel. However, if this novel was an underworld novel with three male and female protagonists, and one of the female protagonists had a "Xuan" in her name, then it might be a very famous novel such as "20 Years of the Underworld","The Godfather of the Underworld","The Underworld Business World", and so on. If you have more information about this novel, you can try to provide more details so that I can help you better.

I recommend "The Science Girl in Cultivation" to you. Although the female protagonist in this book doesn't have the protagonist's halo after transmigrating, she has the wisdom of the technological world. Coupled with the body of the Xianxia world, it allows her to advance triumphantly on the path of cultivation. At the same time, although the male protagonist doted on the female protagonist, he was also very powerful. The two of them helped each other in cultivation and established an equal and harmonious relationship. I hope you like this fairy's recommendation. Muah ~😗

There were many novels about the underworld campus on the novel reading website. I recommend the following: "Misleading the Evil Prince": The male protagonist was a legendary figure in the school. The female protagonist and him were at odds at first, but later they fell in love. The plot is sweet and spoiled, the whole text is not abused, the man is strong and the woman is strong. "School hunk, please advise": The female protagonist mistakenly entered a noble school, while the male protagonist was a real wealthy family. The two of them were at loggerheads when they first met. Later, they dated in a high-profile manner, showing off their love everywhere and spreading dog food everywhere. I hope you like my recommendation. Muah ~

😋I recommend the following two novels to you. They are both underworld novels with male protagonists: [Fatal Battle: The protagonist's genes have awakened for the second time, and he has unexpectedly obtained the ability to resurrect indefinitely. Moreover, his strength will increase by leaps and bounds after each resurrection.] From then on, he walked down a path of no return… "Ancient Martial Arts of the Heavens": The protagonist, Zhao Ying, transmigrated to a parallel world and obtained a powerful cheat. He reincarnated into the heavens and defeated the unjust. The bad guys were in despair. I hope you like this fairy's recommendation. Muah ~😗

"The Reborn Beauty,""Forced Marriage,""Uncle Liu in the Female World,""There's a Rebellious Lady at Home,""Super Close Bodyguard," and "Mistaken Evil Prince" all met the requirements. The male lead was a gangster. I hope you like my recommendation. Muah ~

😋I recommend the following novels to you: 1. "Underworld's 'Stupid' Queen": This is a new novel recommended by Shui Yunxing. It tells the story of a gangster who accidentally saved a 'stupid' girl and the sweet love between the two. It's so good-looking that you can look at it if you want to spoil it. 2. "My Husband Is Two-Faced": This book was written by Young Master Liu from Flower Street. It was a novel about a female protagonist and her husband. The male protagonist was a two-faced CEO, but he was super good to the female protagonist and doted on her. The plot was exciting and the character was subverted. It was very worth watching. 3. "Mr. Prosperous Woman": This is an ancient romance novel written by Tao Shishi. It tells the story of the female protagonist who saves her country after her rebirth and becomes a strong woman. She has superpowers. The plot is unique, and the characters are really cute. I recommend it. These are my personal recommendations. I sincerely hope that you will like them ~ If you want more similar novels, please feel free to tell me.

I recommend "I Have Countless Guardians" to you. This is a sci-fi novel written by the author, Xiao Lu Qing Shi. The main character has an unexpected ability. He can summon the main characters in all kinds of dramas, movies, and ACGN works to become his guardian spirit, making the main character invincible from the beginning and surrounded by countless female leads. I hope you like this fairy's recommendation. Muah ~😗

😋According to your needs, I can recommend a few novels to you: 1. [Fighting to build the underworld, starting with the medicine elder as a judge]: The main character transmigrated to the Dou Qi continent, activated the Son of Heaven Yin system, and rebuilt the underworld on the Dou Qi continent. Appointing a strong person as an official of the underworld could obtain a generous reward. 2. "Mysterious Revival: I Am the King of Hell": The protagonist awakens from this world, brings along strange rules, creates the Yin God of Hell, and reconstructs the order of Hell. 3. [Supreme Life and Death Book: The young man accidentally got the Life and Death Book written by someone. From then on, he was out of control. He built the underworld and opened the eighteen levels of hell to become his minions.] Set up the Ten Kings of Hell, restart the cycle of reincarnation, and suppress all those who refused to submit. 4. <I built the underworld in another world>: When the underworld descended to the cultivation world, Lin Fan, the Emperor of Feng Du, set up the underworld and controlled the Six Paths of Reincarnation, opening the door of reincarnation. I hope you like my recommendations. If you have any other needs, you can tell me at any time ~😗

I recommend the following two novels to you: 1. "The Evil Young Master's Loving Wife": The male lead is a celebrity in the entertainment industry, and the female lead is an evil young master. The love story between the two is hilarious and sweet. 2. "Hello, Mr. Gu": The male and female leads were both celebrities in the entertainment industry. They met again after five years of separation due to a misunderstanding. The male lead chased after the female lead. The interaction between the two was very interesting, full of sweetness and humor. I hope you like this fairy's recommendation. Muah ~😗

The characters included the male lead, Yan Xiu. "Bringing the Underworld to the Underworld" Author: Fate to the Red Dust. It is a fantasy/oriental fantasy novel with a system style and calm elements. It is finished and can be enjoyed without worry. User recommendation: The underworld appears, heaven and earth change; The King of Hell comes out, the three realms cry. The Son of Heaven's Mandate, the Ten Hall Masters, the Day of Reunion, the Nether World… The living had a world of life, and the dead had a country of ghosts… 10,000 years ago, during the great war between gods and demons, the Heavenly Dao was shattered, causing chaos in the Yin and Yang worlds. Coincidentally, the Netherworld came into being. Let's see how Yan Xiu re-established the order of the Underworld by possessing the Ghost Emperor, obtaining merit and proving the Boundless Dao… I hope you will like this book.