There was a novel with an urban theme in which the male protagonist did not know his past and lived with his ex-lover's son and mother. When the male lead lived with the son of his ex-lover, their family was very rich.

Answer 1

I don't think it'll necessarily meet your needs, but I'll try my best to recommend a novel that's most relevant to your description of your needs."The Longevity Son-in-law's Nanny Father" is a novel about urban life written by the author, Feng Yu Shuang Xue 1. The general plot of this novel is as follows:

No one would have thought that a good-for-nothing son-in-law was actually a rich man. However, he had been staying by his wife and child's side all this time. What was wrong with him? What was he plotting?
----------------------------
"My Husband Is Reborn" was a modern romance novel written by the author's drama team. The general plot of this novel was:

"Sir, Madam was mocked by the lady at the counter when she was shopping at the jewelry store today. She said that she was a country bumpkin and couldn't afford it." The next day, the jewelry store changed its name and Gu Ran became the boss. "Boss, Madam was hit on at the ball today. That person claimed to be the son of the richest man in City W." Not long after, the richest man in City W changed hands. It was someone else. He was the youngest dignitary in Country Z and had a prominent reputation. He was also the most legendary Earl in America. He controlled three major financial groups and was very rich. His handsome appearance made all the women go crazy. However, he loved a little woman named Gu Ran and doted on her.
----------------------------
The book,"So I'm So Rich," was a novel about urban life written by the author, Qi Qianliu. The general plot of the novel was:

His childhood sweetheart's fiancée despised him because she had no money. His classmates at school did not like him because he was poor. That day, Lu Xiao, who was in a daze, suddenly received a call. The guy who called himself his father said that he was the richest man in the world…
----------------------------
"The CEO's Confused Little Wife" was a modern romance novel written by the author, Gu San 'er. The general plot of this novel was:

He had loved her for six years, but she had been by someone else's side. Once she lost her memory, she bumped into him. She had married him for her grandmother's medical expenses. He was handsome, gentle, and rich. She slowly fell into his love net…She had a mother-in-law at home to make things difficult for her, a mistress to fight with, and an ex-boyfriend of a jewelry tycoon who appeared out of nowhere…It didn't matter. Let's see how she pretended to be a pig to eat a tiger. However, after she recovered her memories, she discovered a shocking secret.
----------------------------
"Long Married: The Ex-Husband Has Bad Intentions" was a modern romance novel written by the author, Ah Li. The general plot of this novel was:

Xu Yanfei stole her identity. She lied to her son. She hated him for being heartless, but she never thought that he would steal and rob just to feed her. "Haven't you heard that if you want to climb up, you have to find a rich person? I'm not only rich, but also powerful." The plot is fictional, please do not imitate it.
----------------------------
"The Girlfriend of the Wealthy Master Leng (Complete)" was a modern romance novel written by Wei Ran Yufeng. The general plot of the novel was:

The boyfriend she had been in love with for three years was married, and the bride was not her!
The scary thing was that the target was actually the mysterious crown prince of the corporation!
*
He was the "handsome and romantic" prince.
Elegant, elegant, and proud…Sigh, he was the representative of the ten outstanding men!
His first girlfriend had abandoned him for money! From then on, he did not believe in love. He believed that a woman's "love" was equal to the thickness of money!
*
She was a stubborn old woman who was "old-fashioned, reserved, and inflexible."
She believed in love. Even if her boyfriend abandoned her, she would not give up on finding her own love!
*
In order to raise money for her brother's treatment, she had no choice but to lower her proud head to him.
As for him, the feelings that money had bought made him hate her, especially when he found out that she was the sister of the woman who had abandoned him for money back then.
Revenge was the only feeling he had for her…
Do you like money? He used money to buy her feelings, her person…
When the two hearts were getting closer, his beloved lover, her sister, had returned…
----------------------------
"Rich Man's Addicted Pet: Master Leng's Blind Wife" was a modern romance novel written by the author Yo Rice Ball. The general plot of this novel was:

There was a kind of love called love at first sight, and there was a kind of love called first love. They used to be an enviable sweet couple on campus, but in the end, they didn't get together. When they met again, one of them was already a domineering CEO, while the other had lost his light and fallen into the darkness.
She couldn't see him, so she didn't know who was in front of her, and he chose to hide his true identity.
The misunderstanding back then made him struggle between love and hate, but in the end, he could not bear to hurt her at all. An accident had unexpectedly resolved the misunderstanding from back then. The knot in his heart was untied, and his love for her was overflowing.
----------------------------
"The Cute Boyfriend" was a modern romance novel written by the author, Mo Wen. The general plot of this novel was:

The once cute boyfriend was a cute boyfriend. At the beginning of the story, she was a top student in a key high school. She was funny and cute, and everyone loved her. He was at the bottom of the list in a key high school. His father had donated a building to the school to get him into the school. A female academic genius, a bookworm, smart beyond the masses, and self-righteous…A rich son, brainless, a playboy, and an idle person…In the middle of the story, he was the heir of a restaurant group. As the vice president, he drove a luxury car, had champagne, and beautiful women, and enjoyed life. She was an elite assistant who had returned from overseas after completing her studies. The first thing she did every day was to make sure that the vice president was in his position. They lived in a house and slept in a bed, and between them was a three-year-old boy named Alexander and a French bulldog who used to be named Alexander. But he didn't believe that she would love him, and she didn't believe that he would love her. The later part of the story, you are a young love. The plot is fictional, please do not imitate it.
----------------------------
"Hello, ex-boyfriend!" This book was a modern romance novel written by the author. The general plot of this novel was:

His favorite thing was Money! The thing she hated the most was her ex-boyfriend! A certain man who appeared out of nowhere suddenly snorted coldly, scaring a certain girl who was filling out a survey. Her hand trembled. "I didn't know you had an ex-boyfriend?" A certain someone was confused."Aren't you?" "…Haha." Ten minutes later, Miss Chen handed over a badly smeared survey. [Favorite thing: Husband hates the stinking copper coins.]
----------------------------
The book,"If It's Called No Separation of Hatred in the Eyes" was a modern romance novel written by the author, Muse. The general plot of this novel was:

A young man and woman made a living in the city. After each of them went through a setback, they helped each other and helped each other survive. They took a loan to buy a house. They were supposed to live a peaceful and stable life. Unexpectedly, the female protagonist's ex-boyfriend returned from his fortune and came back to reminisce with him. Their peaceful life was once again disrupted. The female protagonist realized that her ex-boyfriend did not want to marry her and only treated her as a plaything. Therefore, in order to take revenge on her ex-boyfriend…