Strongest Survival by Otome Game’s Heroine (LN) - Chapter Volume 4 6: Dungeon Exploration Beginning

Ning Jiang's father was a famous bridge designer but he was framed and the bridge he designed fell. He couldn't bear what happened and died soon. After his death, Ning Jiang's mother married another man who already had a daughter.

The new family treated Ning Jiang badly. Her stepsister, Mo Lan, even got involved in her relationship on purpose. As a result, her boyfriend betrayed her and Ni Jiang's heart was broken.

Meanwhile, Ning Jiang discovered that what happened to her father might be related to her stepfather or a man, Luo Hanshang, the fiance of her stepsister, who was in power of a huge business empire.

To find out the truth behind her father's case and even take revenge, she set up a trap for Luo Hanshang and attracted him successfully. She helped him solve a big case and won his trust. Then he married her as she planned. As time went by, he fell in love with her and even melted her heart, but she never gave up revealing the truth...

What if your own father and his mistress were behind your mother’s death? What if you were about to be sold off to a scumbag?

What would you do? In the nick of time, a tall, rich, & handsome guy descended from the sky and came to her rescue with a piece of contract.

Xin Qing glowered at the man before her. At first, she had thought of him as her Prince Charming, in the end, he turned out to be an evil demon.

“You’re not allowed to go. You can only marry me!” the man said viciously to the woman who was about to leave.

Xin Qing sneered. “Isn’t the ancestral behest the only reason you’re keeping me around? I’m just your tool.”

He said, “Who told you that?”, his eyes filled with profound emotion.

“You’re the mother of my child!”

- Description from Novelupdates

Seo Tae Hyuk, jailed after being falsely accused.