The male protagonist was the emperor, and the female protagonist was the emperor's concubine. At first, the emperor didn't like her, but later he slowly fell in love with her.

There were a few novels about the main character's father's concubine that he could recommend. Among them were " Why Did Father Rebel "," Father, I Really Don't Want to Be the Crown Prince "," The Crown Prince and the Prime Minister Father "," The Crown Prince's Beauty: Father, Where's Your Morality ", and so on. These novels involved the relationship between the crown prince and his father. The plots were different and could be read according to one's personal preferences. In addition, there was also a novel called " The Emperor and Empress's Conspiracy for the Empire." Although it did not completely match the title mentioned, there were many similarities between the relationship between the father and the son. He could also consider reading it.

😋I recommend the following novels to meet your needs: " Tsundere Beauty Queen: The King's Power ": The female protagonist is a reborn beauty, the emperor's favorite, and the palace fights. [Solitary Beauty]: One of the stories was about the love story between the proud daughter of a noble family and a cold-faced emperor. " The Evil Emperor's Strong Pet: The Supreme Mad Queen is a thousand years old ": The female protagonist is a transmigrator, shouldering a heavy responsibility. She disguises herself as a man in the scheming royal family. The male protagonist is sometimes an immortal and sometimes crazy like a demon. He dotes on the female protagonist alone. I hope you like my recommendation. Muah!😗

😋I strongly recommend "This Star Lord is a bit silly". The male lead is a star lord and not an emperor, but the female lead is also a concubine who traveled to ancient times. The two people slowly developed feelings for each other. The ending was also Happy! I hope you like my recommendation, Mwah~

😋I recommend the novel, Love Step by Step: Genius and Pretty Crossdresser. It's a novel about time travel and strange feelings. The female protagonist, Mo Yu, transmigrated to ancient times to become a young master and was deeply involved in one mystery after another. The male protagonist met her because of the portrait of the former emperor and fell in love with her. I hope you like my recommendation.😗

I recommend " My Demonic Princess " to you. The male protagonist of this novel was called Di Che. He was the son of the Heavenly Emperor, while the female protagonist was a princess of the demon world in her previous life. The two fell in love in the process of saving the world and gave birth to twins. This novel told the story and adventures between them. I hope you will like this novel.

This type of novel was called " The Forbidden Concubine of the Royal Family." The background of the story was that the male protagonist was an emperor in ancient times, and the female protagonist was a palace maid who entered the palace as a concubine. The female protagonist traveled to ancient times by accident and found herself a woman, but she quickly adapted to the life of the ancient times. After becoming a concubine, the female lead and the male lead met and gradually developed feelings for each other. However, the male protagonist had a beloved concubine, and the female protagonist decided to leave the male protagonist in order to avoid becoming a victim of their battle. Before leaving, the male protagonist found out the true identity of the female protagonist and was very guilty. He decided to take care of her and help her regain her status. In the end, the female lead successfully became the queen with the help of the male lead, and the two of them lived a happy life together.

My dear, I am very confident in recommending the novel 'The King's Conspiracy' to you! The main character of the novel was a proud princess, and together with the playful transmigration female supporting character, they started a fight in the palace. The younger sister was the emperor's concubine, and the male protagonist was a playboy emperor, but he fell in love with the female protagonist at first sight. Although this novel is about ancient romance, it has a happy, relaxed, and interesting atmosphere. It's very suitable for you. I hope you like my recommendation! Muah ~

This novel might be called " The Noble Consort's Promotion ".

I recommend 'Godly Doctor and Poison Queen: I Want to Get Out of the Wall' to you. The female protagonist of this book transmigrated to the emperor's side and was conferred the title of concubine by the emperor. However, the emperor's temper was temperamental. The female protagonist kept trying to escape, but she was found by the emperor every time. In addition, the female protagonist was a divine doctor who also knew the secret of the peerless poison. In order to protect herself, she also fed the emperor some poison. I hope you like this fairy's recommendation. Muah ~😗

The novel where the male protagonist transmigrated into Emperor Chongzhen and the emperor was having sex with his father's concubine was probably " Emperor Transmigration: Reborn as Emperor Chongzhen."