The Rational Detective in Detective Conan - Chapter 1: Ran Figures It Out

This is a reincarnation/isekai story, about Matt (later TreeTree), an overpowered tree in a fantasy world that serves as the battlefield for an ongoing conflict between demons and the heroes summoned to oppose them.At first a bystander, over a long period of time, TreeTree will learn all sorts of skills, gain levels, and in doing so, build up a forest, train young subordinates, protect a village, and more.

Dragon 5th is a powerful lord with incredible martial arts, and yet is wasting away from a fatal disease. The only medicine which can cure his sickness lies in the clutches of his venemous ex-wife, Madam Lovesickness, and is guarded by 7 dangerous killers, fugitives of the martial world. To retrieve the antidote, Dragon 5th hires Liu Changjie, a skilled martial artist who loves drinking and women, but has a mysterious past. All is not what it seems in this wuxia heist story.

When Ren Sheng is being hunted, in order to not fall into the hands of his enemies he decides to jump into the crack of space and time. Unexpectedly, he crossed into the future and was forced to substitute as a bride while he was still in a coma.

When he wakes up, he actually has a husband… Ren Sheng is extremely satisfied.

Such a delicious nourishment, this is his first time seeing it! Really want to root up ah ah ah!

As a result Lord Marshal, who was sick in bed, had a “little wife” who has been touching him all day and drooling over him.

- Description from Novelupdates

He was a wealthy and mysterious financial backer who had appeared before her when she needed money the most. After the courtship, she took the money and left.