Fairy Tail: Lost One - Chapter 16: Tainted Waters

Xu Mo, a modern high school student was sent back in time to Jing Kingdom and found herself trapped inside of the body of a princess with the same name.

She had barely recovered when she learned of an unparalleled fiancé and in a daze, they got married. Then the stunning genius physician who normally does not pay attention clamoured to marry her. After that, there was a cold general, a flirtatious lord, a tsundere young master……

As it turns out, this was a male-dominated dynasty. Because the female population was sparse, the entire nation shared wives regardless of rank or nobility. Is it feasible for someone who wants to maintain monogamy in this dynasty?

- Description from Novelupdates

Mo Chu was reborn. She opened her eyes to find herself in a world where a thousand years had passed. The docile animals and plants became very aggressive, and elemental abilities that existed only in stories and legends now appeared before her eyes! Fortunately, upon waking up, Mo Chu gained a nice-guy brother who had a sister complex. Unfortunately, she had a one-in-a-million sensitive constitution, so she couldn’t consume 99% of the available food. However, there would always be a solution. If she couldn’t eat the food of this era, couldn’t she come up with new food? And so, she made fries, grilled fish, beggar’s chicken, and various other delicacies that were not available in this future world. As a glutton, Mo Chu was satisfied with this outcome. However…

The story follows Matt, a young man planning to delve the rifts responsible for the monsters that destroyed his city and killed his parents. His dreams are crushed when his Tier 1 Talent is rated as detrimental, and no guild or group will take him.Working at a nearby inn, he meets a mysterious and powerful couple. They give him a chance to join The Path of Ascension, an empire wide race to ascend the Tiers and become living legends.With their recommendation and a stolen skill, Matt begins his journey to the peak of power.

I met the male lead in prison.