I recommend a Xianxia novel with the king and princess as the main characters. The female protagonist is challenged because she has to replace her sister to marry.

"I recommend" Jinxiu Ronghua: Marry the Second Miss ". The female protagonist married the male protagonist in place of the young lady because her parents treated her very well and lived a beautiful and prosperous life as the young lady. I hope you like this fairy's recommendation. Muah ~😗

I recommend " Substitute's Favorite Concubine ", an ancient romance novel. The female protagonist was the emperor's favorite princess. For him, she swapped identities with her sister, but she was mistaken and her future became quite bumpy. I hope you like my recommendation.

I recommend the book "Rules of Rebirth Space" to you. This novel is an ancient romance novel. The protagonist is a local reborn woman who is competing with a modern transmigrator. In the plot of the novel, because the protagonist was in a hurry to prepare for the wedding, he mistakenly thought that the transmigrated female sister in front of him was married to her fiancé's second wife. Later, the protagonist had an accident and she was reborn. Because of the disappointment in her trust in her sister, the protagonist would have a wonderful PK with the transmigrated female after rebirth. I hope you like my recommendation. Muah ~

I recommend "The Reborn Wife of the Underworld". The female protagonist, A'cha, is of noble status and is very powerful. Her brother is the Underworld King. After she returned, she lost her memory but has the Underworld King's heart and ability. She is quick to repay kindness and hatred, arrogant and low-key. It is worth watching ~ I hope you like my recommendation. Muah ~😗

In the recommended novel,"The Reborn Invincible Business Girl," the female protagonist, Liu Li, was reborn as the daughter of the Feng Corporation's head, Xia Tong. She relied on her previous life's business accumulation and special abilities to start from scratch and become her own business empire. In the end, she obtained a happy love. I hope you like this fairy's recommendation. Muah ~😗

In << Fate's Wrong Marriage >>, the female protagonist married her brother-in-law on behalf of her twin sister in order to protect her sister and brother-in-law's reputation. However, on the night of the wedding, she was eaten by her brother-in-law.

I recommend the modern romance novel "Husband Lost His Memory in a Car Accident on the Day of Divorce" to you. Although the plot was not exactly the same, it also involved mental disorder and amnesia. I hope you like this fairy's recommendation. Muah ~😗

😋According to the plot information you provided, I would like to recommend the ancient romance novel "Twilight Song Waiting for You to Return" to you. The female protagonist of this novel, Lige, was found by her father to marry the emperor in place of her sister. The story is very exciting. I hope you like this fairy's recommendation. Muah ~😗

I recommend "The Godly Doctor's Stupid Concubine: The Ghost King's Gorgeous Concubine" to you. This is an ancient romance novel. The female protagonist is the unfavored second daughter of the Mo family. After she transmigrated, she was framed and became an idiotic abandoned concubine. Later, when she opened her eyes, she took a fancy to the masked ghost king, and the story between the two began. I believe that you will definitely like this book! I hope you like this fairy's recommendation. Muah ~😗

" After Rebirth, I Became the Chief Assistant's Wife " is an ancient romance novel written by the author Xin Lu. The general plot of this novel is: In her previous life, Yun Zhuo married the glamorous King Duan as his princess consort as a concubine's daughter. All the noble ladies in the capital envied her good luck. However, in less than three years, everyone pitied her again. King Duan had a respected status, and he was gentle and refined. There were many beauties in his residence. Not long after, the Yun family was involved in the crime of rebellion and was exterminated. Under such circumstances, the number one beauty in the capital could not escape the prophecy of her poor life and finally threw herself into the lake to commit suicide. Fortunately, she had the opportunity to be reborn. Yun Zhuo decided that this time, she wanted to be above everyone else. The good friend who had harmed her deeply, the concubine who had plotted against her life, the husband who had ruined her life, she wanted to step on all of them! However, didn't we agree that it was just a cooperative relationship? Why did you take off your clothes? The plot is fictional, please do not imitate it. ---------------------------- " The Reborn Daughter of the First Prince, Elegance " was a fantasy romance novel written by the author, Women Must Have Bones. The general plot of this novel was: A daughter of the Yun family had just grown up, and her pink and cute face had turned ugly. The prince of the royal family broke off the engagement in a hurry, and the position of the Yun Mansion was in danger. Ugly good-for-nothing girl was thirteen years old, and she became famous in one battle. Her white clothes fluttered and her purple eyes were charming. Her white hands saw through the jade in the stone. The king ordered the king to kill the evil woman, and from then on, he became a man and traveled all over the world. The Underworld Empress was too monstrous! ---------------------------- " My Empress is Reborn " was an ancient romance novel written by the author, Yunjuan Yunshu. The general plot of this novel was: She was the sorrow in the depths of the harem. She died with hatred and was reborn as a princess. She was bewitching and sharp, and no one dared to provoke her. Fickle Emperor: After rebirth, you are still my empress. You can forget me completely, but you will not ignore you and my son. Ling Huayue laughed it off. [The plot is fictional. Please do not imitate it.] ---------------------------- " The Rebirth of the First Daughter: Please Marry the Evil King " was an ancient romance novel written by the author, I'm a Supervillain. The general plot of this novel was: When they first met, she was an unlucky girl with a broken leg, and he was a blind prince in a sorry state. When they met again, she was the famous noble daughter of the marquis's manor, and he was the glorious Imperial Prince. Chu Yunluo had transmigrated and became the unfavored Di daughter of the marquis. Was she being persecuted by a Shu sister? Then let her know what it meant to differentiate between superior and inferior! Since her aunt was disciplining her, she would let her see who needed to be taught a lesson more. As for that father who did not love her and was blind, she would let him scram to the side. She only had two wishes in her life. One was to make the wishes of the person she valued come true, and the other was to never be separated from Rong Qingxuan. The plot is fictional, please do not imitate it. ---------------------------- " Shu Nan Obey " was an ancient romance novel written by the author, Yun Ni. The general plot of this novel was: She was a concubine's daughter. She had mistakenly believed in kinship and paid with her life. When she was reborn into the human world, she returned to this place as the daughter of a concubine. Who would still remember the daughter of a concubine who died for this prosperity? Even if there were many difficulties, she had to give it her all and change her fate. She wanted to let them know what it meant to obey. The sect leader's product, quality guaranteed. * Cult Master Yun Ni's new book," The Lady of the Family," welcomes everyone to watch and support. Book number: 3207576 Who can stop my wife from taking charge of the family? ---------------------------- " The Daughter of the Yun Family " was an ancient romance novel written by Yanran Ruochen. The general plot of this novel was: It's a new article. A delicate wife is difficult to pamper. My girl is too changeable. Dear friends, if you are interested, you can go and take a look. Everyone can collect it first. Yun Wanqing, the youngest daughter who had transmigrated into the Prime Minister's Estate of Chuxia Country with her memories. Her father doted on her mother, and her brother and sister doted on her even more. However, the heavens had played a big joke on her, causing her to be poisoned from the day she was born. Every once in a while, it would act up and make her wish she was dead. Fortunately, she met a good master. After leaving home for ten years, what awaited her was the childhood sweetheart who had been by her side since she was young. Yanran's new book, the ancient romance, a story of transmigration and rebirth. I look forward to your attention. ---------------------------- The book," The Beautiful Lady's Concubine ", was an ancient romance novel written by the author, Shu Ying. The general plot of this novel was: The Yun family was convicted, and the Yun family's twin sisters were demoted to commoners. From then on, they were buried deep in the mud. Yun Qingqian, who had been reborn, vowed to change all of this. She would clear her name if she was wronged. She would change the rules if her identity was lowly. In short, she would plot for everything she wanted. "This king is waiting for you to plot." A certain man had an evil smile on his face." Wait after you're done bathing." The plot is fictional, please do not imitate it. ---------------------------- " The Peerless Second Miss Fenghua " was an ancient romance novel written by the author, Childe Yuhua. The general plot of this novel was: The great inventor Mu Ning, who had transmigrated from 4000 AD, had become the most controversial second daughter of a concubine in the Defender General's Mansion. All the bad adjectives such as silly girl and shameless had become her symbol. However, Li Muyun didn't despise her silly sister. Instead, she protected her and loved her. One day, she suddenly realized that her gentle, virtuous, and well-educated elder sister had turned into a handsome, suave, and elegant elder brother overnight, which made her very mad. The Northern Country was a beautiful place. Ming Dongxue, who had disappeared for a long time, suddenly appeared. Her real identity was… " Eldest Sister's cross-dressing is devastatingly beautiful, while Eldest Brother's cross-dressing is heroic. They're really harmful…" ---------------------------- " The Legend of Yun Hua " was an ancient romance novel written by Suyi Qiong Hua. The general plot of this novel was: In her previous life, she was the daughter of the marquis's family, born in a prestigious family and had a noble status. A conspiracy, the decline of her mother's family, she was set up by her stepmother to marry a bad person. She taught him everything she knew and helped him ascend the throne. She never thought that the day he ascended the throne would be the beginning of her nightmare. After spending her days in the cold palace, she suddenly realized that in this life, she was just a chess piece played in the hands of others. A huge fire burned everything. The phoenix bathed in fire and was reborn. In this life, she would not allow anyone to bully her, humiliate her, or abuse her a single bit. The pain of the past year would be repaid a thousand times over. A gilded mask and a gorgeous purple robe. It turned out that his high position and power couldn't compare to his love for a lifetime. The reason for his two lifetimes was because of his deep love. This life is lonely, you and I accompany each other, enough! The plot is fictional, please do not imitate it. ---------------------------- " Rebirth of the World: The Belle Queen " was an ancient romance novel written by the author, Yun Ranran. The general plot of this novel was: The older nurse in the modern world was reborn as the Prime Minister's daughter. She was beautiful, but she was framed by her aunt and sold to a brothel. Legend had it that the playboy Seventh Prince wanted to marry her as his concubine. Step by step, in the Seventh Prince's Mansion, she, Zhan Zhengfei, and Madam Dou, were unexpectedly involved in a bloody conspiracy. The heavenly daughter came to the world, and those who got the heavenly daughter got the world. " Baili Yao, since you're treating me like this, I'll help you take down this great mountain."