MTL - Lord of the Secret Art! - Chapter 526 "Turtle Shell"

Rudel Arses, the first born of one of the ‘Three Lords’ of the Courtois Kingdom, is from a corrupted family, but at 5 years old, he saw a dragon in the sky and his dark future as a villain changed. He was considered an idiot, but was that true? How would his effort to become a dragoon change the kingdom?

The two faced number one female spy transmigrates to a different world and becomes an outrageous idiot girl. When she woke up, what she had to face was consecutive blows of the decline of her family clan, her crippled martial skills, and her disfiguration. To protect her family, she must obtain the treasured book, obtain outstanding achievements, summon a dark beast army. Wait and see how in this unfamiliar, dark magical continent, she dies and becomes a demon then steps up to the top, making all of the formidable people in the world bow down to her in respect.

- Description from Novelupdates

On her wedding day, she was humiliated; her status as the legitimate wife was instantly changed into that of a concubine.

In the second year of marriage, Yvette Thiel was pregnant.Yvette was full of joy, but she got a divorce agreement.In a car accident, Yvette lay in a pool of blood and begged Lance Wolseley to save their child, but Lance left with his sweetheart in his arms.Yvette was disheartened and slowly closed her eyes.Later, it was heard that Lance from New York had a taboo name, and no one could mention it.At the wedding, Lance suddenly went crazy. He knelt on the ground and looked at the cruel woman with red eyes. “You are pregnant with my child. Who do you want to marry?”