The Black Beast’s Useless Concubine - Chapter 2513

She is a two-faced and fierce hidden ghost doctor,

Dante is a budding young man who has the dreams and hopes of entering society with his own skills, independent of the help of family and friends.

As a small-time app developer, he eventually tries to jailbreak his new phone when a malfunction occurs, and his phone swallows him into a wormhole.

On the other side, Dante appears in an alleyway of a bustling city... Avalon!

This futuristic city leaves him dumbfounded until he is prompted by his phone which has now merged into his body that he can travel between two universes, Earth and the Eternal Universe.

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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