Jaku-chara Tomozaki-kun - Volume 1 Chapter 4 part4

The genius pharmacist transmigrated into a pitiful farm girl’s body. Ignored by her own father, abused by her stepmother, and bullied by her stepbrothers. Her “twin” brother was given to distant relative and she went as the “extra” to live under someone else’s roof.

Luckily she possessed mad apothecary skills. Collecting herbs, plowing herb fields, formulating medicines and treating the ills, she refused to live an ordinary life as she slowly uncovered the truth of her real identify.

Inadvertently, she saved a dashing man who was in reality a big, bad wolf hiding under the skin of an innocent little puppy. He pulled out all his tricks: I have no other means to return your favor of saving my life. What say I repay you by marrying you?

- Description from Novelupdates

The maniac who was crazy about all kinds of fields such as military and steampunk had been reincarnated.

However, his father was King Sejong the Great?

The mania-wise king and his crazy maniac son.

Along with the ministers, and countless humans who were getting exploited.

Even today, the night of Joseon was filled with the light of overtime.

Payload specialist, Tang Yue, who is a mechanical and electrical engineer by training, is left stranded on Mars when he receives news from his AI robot assistant, Old Cat, that Earth has exploded. He believes himself to be the last human in the Universe.

A young boy named Bai Wu was saved and adopted by a thirty-something police sergeant named Xu Lan. It was love at first sight for Bai Wu, and once he started getting older, his heart yearned for a taste of the forbidden fruit – the romantic love of his adoptive father. The question is, will Xu Lan ever reciprocate? With deranged serial killers, parallel dimensions, time warps, dragons, and a bit of ancient black magic, Bai Wu and Xu Lan are caught in a series of crazy adventures while discovering what they truly mean to each other. This is a story of lust and madness!