Can you help me find a novel whose name I don't know? Thank you!

I don't even know the name of the novel. The plot of the story seems to say that there was a pair of sisters who were separated from their parents. When they grew up, there seemed to be a marriage agreement that was originally meant for the younger sister. However, for some unknown reason, the younger sister could not fulfill it. Therefore, the father found the older sister who lived with the mother to marry in place of the younger sister. The older sister had a stable personality. For some unknown reason, she agreed to marry in place of the younger sister. That's all I can say about it. I remember that it seems to be Xi Juan's. At that time, I was a big fan of her book, but I'm not sure. I've been looking for it for a long time!
It should be modern. The male protagonist was in business. He seemed to be from some big company. The place seemed to be in Taiwan.
I went to read the book on the second floor. I feel that the content is a little superficial. In the book I found, the male protagonist had seen the younger sister (or older sister) before. He didn't have a particularly good impression of her. It was just driven by the interests of the family. Or rather, he didn't care. The female protagonist seemed to have never met the male protagonist (or had met him once). Anyway, it was a very shallow relationship. In order to replace (the younger sister or older sister), she directly married him. At first, the two did not meet. The female protagonist seemed to be indifferent, and the male protagonist was not in a hurry (probably because he did not leave a good impression in the past). From what I remember, when the male protagonist was not at home, because something happened at home, she handled the crisis reasonably and perfectly without a decision-maker, making the male protagonist who came back later look at her in a different light... He had only seen this much, but he didn't continue reading or remember the name. That was why he was so troublesome to find.
Looks like it's really hard to find!
I've already looked through Xi Juan's books one by one, but there's nothing I'm looking for. Actually, I'm really not sure if it's hers. From the looks of it, it might not be.

Answer 1

It might not meet your needs, but I'll try my best to recommend a novel that is most relevant to your needs: Why Are You Leaning On Me?"was an ancient romance novel written by the author, Mu Lanxue.

"Tell me, who is the person I saw in your memory?"
"Which one?"
"Still pretending? It's that prince that you're begging to follow!"
"State Preceptor, you really don't know him?"
"Nonsense, how could I know your old lover?"
"But that's you!"
This is a story of recovering what was lost. Step by step, I understand your heart and remove the obstacles on the road ahead bit by bit... You can go and take a look at the new article,"The Way to Open the Matchmaker."
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"I Can Revise My Script" was a mystery novel written by the author, Little Fish Pond. The general plot of the novel was:

My name is Qian Ye, and I'm a novelist. Three years ago, I met a girl called Youjian. I had a passionate relationship with her…But later, she disappeared. Just like that, she disappeared from my eyes and everyone's memories. I tried to find traces of her existence, but I couldn't find any information. One day, there were two more chapters of a strange novel in my draft box that I couldn't delete. At the end of the novel, there was someone shouting,"Save me!"... I was pulled into a horror novel, starting from a passerby…I am searching for her, I am redeeming myself. I can change the content of this novel world... [PS: Not in the first person][PPS: New book "Gradually Going Crazy" has been released. Welcome, everyone. Thank you.]
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"Movie World Salvation" was a novel by the author, Rise of the Gorilla. The general plot of the novel was:

I'm the brother-in-law of Lu Huiyi in "I'm not the Drug God." In order to save Lu Huiyi, I chose to cooperate with Cheng Yong. In the end, the ten-mile pavilion sent me back.
I'm a detective in Detective Chinatown. I wanted to save Snow, but she turned out to be the biggest BOSS. How malicious can a person be? I've seen it this time.
In "Charlotte's Worries," I beat up Xia Luo, kissed Qiu Ya, and crippled Chen Kai. Here, I call the shots.
I am Yu Huanshui from "I am Yu Huanshui." I beat up my brother-in-law and made Gan Hong leave with nothing. In this life, I, Yu Huanshui, will never be a coward again.
…
Hello everyone, I'm Xiao Lin, who has taken orders. If you have any special needs or are satisfied with the plot, please let me know. I'll help you change it.
QQ group number: 547748245.
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"Raising a Son for a Rival in Love" was a modern romance novel written by the author, who was still me. The general plot of this novel was:

Scene 1:
"Hello, is this Miss Bai Ling?" He opened the door and saw a courier standing at the door. He asked politely.
"It's me."
"There's a delivery for you. Please sign here." The courier handed over a document.
"Oh." It was her express delivery. She didn't remember anyone sending her anything. However, Bai Ling still quickly signed the document.
"This document and this child are yours. Goodbye." The courier took out a child from nowhere and pushed it into Bai Ling's arms. Before Bai Ling could come back to her senses, it disappeared without a trace.
Scene 2:
Bai Ling lowered her head and looked at this seven or eight-year-old boy. He looked very cute, but whose child was he? Why was he at her doorstep? Bai Ling lowered her head and tried her best to smile sweetly.
"Little kid, what's your name? Where do you live? Can I send you back?"
“…”
"Little friend, where's your daddy and mommy?" It didn't matter if he didn't answer. He endured it and asked patiently.
“…”
"Little friend, you..." Before Bai Ling could finish speaking, this little friend spoke up. However, Bai Ling was stunned because he called out to Bai Ling,"Mommy." God, she did not remember having a baby.
Bai Ling felt that she must have forgotten to offer incense to Bodhisattva. That was why God was treating her like this. Eight years ago, when her boyfriend of three years stood in front of her with a pregnant woman and asked for her forgiveness, she thought that she was young and ignorant and had mistaken him for someone else, so she casually dumped that man.
Even though she had left in a carefree manner, her heart was not that carefree. After all, it was her first love. She had invested all her passion in that man, but in the end, it had ended up like this. How could she not be heartbroken? From then on, she dared not to trust men easily. She had not had a boyfriend for eight years, but the heavens thought that she was living too well. She suddenly had an eight-year-old son. Please, she had never had a boyfriend, okay? Where did this son come from? However, when she found out about this child's background, she was stunned. This child was actually the son of that adulterous couple from eight years ago. Alright, even if she was kind, patient, and liked children, if this child was the son of your love rival, no matter what the reason was, there would be a difference.
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Finished article: cold-faced husband chase wife, abandoned concubine is also popular, through the cold heart fairy son.
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"The Road to Cultivating a Protagonist" was a fantasy romance novel written by the author, Chen Ni. The general plot of this novel was:

She thought,'It's been more than three thousand years? Well, I'm running out of patience. There's not much time left. I might as well force my way out…
Eh? This kid…
Oh, just nice, it's him!
Here, start your path as the main character!
"Huh?" What was going on? I only remember a flash of white light. Why did I change when I woke up? Could they have been captured by aliens?
What was that? All-elemental constitution? A mage? What kind of place was this?
Well…there was a mysterious person? She wants to help me?
…Alright, I understand now. I am the legendary protagonist! (Clenching fist)
The streamlined white light that passed by silently said,"I'm very innocent."
P.S. Please recommend and collect all kinds of things.
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Black Girl Fairy is a Xianxia novel written by the author that day when I was not around. The general plot of this novel is:

Once, he was a Senior Magus, and she was a beautiful immortal. You stab me with a knife, I stab you with a halberd. In the past, he was a playboy and she was a troublemaker. I'm sick of looking at you. Go back to where you came from. Once upon a time, he was a mortal, and she was a blade of grass. He wanted to stew her into soup and drink it. Shi Guang rubbed her hands. Was this person in front of her that person from the past? A new suspense novel,"The Lost Cloud", asking for attention.
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"The Lost Journey of the Leftover Woman" was a Xianxia novel written by the author, Yun Qingsiwu. The general plot of this novel was:

When you don't know who you are, you will feel that life is very difficult. When you know who you are, you will feel that life is even more difficult. My anger can bring death. I have been lost for many years, living in search, just to solve those mysteries one after another. r
Kissamu's new book,[Fate of the Immortal Road] has been uploaded. I hope everyone will support it.
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"The Strongest Female Lead in the Heavens" was a light novel written by the author, Drunken Smile. It was an original fantasy novel. The general plot of this novel was:

When she answered your prayers, you were saved. This was probably the story of a female protagonist descending to the heavens to complete a brilliant and wonderful life on behalf of others. The new book,"This childhood sweetheart has a problem", is in the hot series. You can take a look ~~~.
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"You Call My Name" was a fantasy romance novel written by Yu Xiao 'er. The general plot of this novel was:

In this life, I would rather let down the world than let you down.
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"What Have I Summoned?" was a fantasy novel written by the author, Twilight and Storm. The general plot of the novel was:

[Version 1 Introduction: Looking at the summoned creature that surrounded him, the head of a beautiful girl, the right hand that kept changing its appearance, the monkey tail that slithered like a snake, and the meteor hammer that had a magical charm…]
Hong Xiao Bai could not help but roar into the sky."What did I summon!?" [Version 2 Introduction: The protagonist starts off tall, rich, handsome, and powerful. His grandfather dotes on him, and his grandmother loves him. He brings his loyal dog and maid with him. He can use Gundam to crush the natives in the martial arts world. He can practice martial arts in the technological world and call himself a god. Isn't that beautiful?]