The Farmer's Eldest Daughter Has a Spatial Pocket - Chapter 678 - : Mrs. Zhou, Concubine Gu

Xin Yun, a sarcastic young man, traveled to an unknown world by chance, but lost his chance to become the strongest because of his obsession with women... or sex. In a collision of the powers of nine powerful men, an incredible thing happened. Xin Yun was reborn back to the time when he traveled to the Isekai world. A fantasy journey is about to begin... [The comic adapted from this novel is popular all over the world]

In novels with a stud there is always a Senior Martial Brother like this:

In the early stages of the novel, his innate talent is high, his cultivation is good, his appearance is handsome, and he has an intelligent, cute younger Martial Sister as a fiancée.

In the middle stages of the novel, he is caught unprepared and defeated by a young disciple (the protagonist) in the sect who’s hardly remarkable at all. From then on, he falls from his godly altar and loses his brilliance. Even his young Martial Sister leaves him for someone else.

In the late stages of the novel, he continues to turn dark, going down the Demonic Path and becoming the major villainous boss. However, the protagonist still ruthlessly defeats him and his soul is eternally sealed.

Once Qin Mo opened his eyes, he discovered that he had become this Senior Martial Brother.

- Description from Novelupdates

A lost soul from Earth transmigrates to a world of cultivation and finds himself in the body of a playboy noble and complete waste. Except he doesn't have any memories, can't let anyone know he's not the same person and is immediately involved in a conspiracy with a powerful noble family.Luckily he came to this world with a power, whatever he gives to someone as a gift he'll get it back 100 times better.His first target?His new wife, the former top young genius.

I, Am a Living Yama; Empress Advises Me to Stay CalmYang Yi crossed over and unexpectedly awakened the Poison Expert System.Empress: “The enemy country has already been destroyed, and there is only a seven-year-old child left in the palace. We are hesitating, what shall we do?”Yang Yi: “Your Majesty, I believe that since this child dared to expose herself, there must be someone hiding. First, pretend to spare her, and then secretly return to see if she has any younger brothers or sisters hidden in the secret passageways. ‘Take care’ of all of them(Kill), and then make a grave for them and pretend to mourn for three years. If anyone comes to pay their respects, they must be her accomplices, and we can eliminate them all!”Crowd: “???”Is this guy a Living Yama alive!???Empress: “You were supposed to provide disaster relief, but you’re adding sand to the porridge? Are you the Living Yama?”Yang Yi: “Let’s see if it works to save refugees, Your Majesty.”Empress: “Now there are rumors out there that the reason I remain single is because I like women. How should we deal with this damage to my reputation?”Yang Yi: “Your Majesty’s reputation is of the utmost importance. As a strategist, I’ll sacrifice myself and imp**gnate you, and the rumors will naturally dissipate!”Empress: “Then get rid of those vixens, you scoundrel!”