This Ninja Is Obviously Not Strong but Really Hard to Kill - Chapter 8: Pull Out Your Oxygen Tub!

Waking in a strange yet familiar room the main character now will rise to the top of one most dangerous worlds of fiction with his new cheat.

Ding Ning was just an ordinary youngster from a small border town in southwest China, but he had learned tremendous medical skills from his masters since his childhood. After graduating from college, he stayed in Ninghai City and tried to seek a job in a hospital there, but things did not go well at first. However, he accidentally saved Shen Muqing who was from a rich and powerful family, and then got involved in the confrontation between Ninghai special police team and a mysterious organization called Vampire Mercenary Group in order to protect Ling Yun who was his landlord’s daughter. It became the turning point of his life. After that, he started an incredible adventure during which he would find out the real identities of his father and masters and discover the secrets behind the mysterious organization Vampire Mercenary Group and the special weapons and tactics team Dragon Soul…
The story tells about how he opened nine apertures, fought with rogues, chased after various pretty girls and established a rich and powerful family by himself. He climbed up to the peak of his life step by step, and finally became medical sovereign.

- Description from Novelupdates

“P-please let me go..” I stammered and before I knew it, I was word vomiting while crying. “—I won’t return. You won’t ever see me again. I know you don’t want me as a mate. You hate me, so please let me go.” I cried out.Cain’s jaw tightened with each word that left my lips “What gave you the idea that you have the power to choose what you want?” His voice was low, “You don’t get to decide what, how, and when you leave. Only I get to do that. You don’t get to leave me, you don’t get to run! You only leave when I want you to.”“I didn’t ask for this,” I whispered, trembling. “I didn’t ask to be your mate.”Cain stepped back, “Neither did I,” he muttered under his breath. “But the bond doesn’t give us a choice, does it?”~~~~As the only child of her late Alpha father, Avery Jae was meant to inherit her family’s legacy. But on the day of her arranged marriage to Alpha Lucian, her world crumbles. Rejected, humiliated, and cast aside for her own cousin, Avery barely escapes with her life only to find out a much deeper secret. One that changes everything.When Avery awakens, she finds herself in a foreign land, caught by the ruthless guards of the Vehiron pack, led by the infamous Alpha Cain. Tall, broad and as dangerous as the army he commands.Alpha Cain has a reputation that sends chills down the spine of even the most dangerous warriors. Haunted by his dark past, he has vowed never to take a mate, yet the moment he lays eyes on Avery, everything changes.With a single word, Avery is bound to Cain—whether he wants it or not. In a world where betrayal runs deep, can Avery ever trust the alpha who might just be her worst enemy.

Humans across the world ended up joining a “Demon Kings and Heroes game”.

Several billion people were set down upon another world to act as “Demon Kings” and “Heroes”. Everyone has to chose their starting races from the start.

Zhang Nu was set in the Demon King camp.

He discovered that he could see hidden information that no one else could.
[Slime Demon King]. Low grade demon king bloodline… Not recommended!
[Kobold Demon King]. Low grade demon king bloodline… Not recommended!
[Dark Elf Demon King]. Mid grade demon king bloodline… Can be selected!
[Bloody Giant Demon King]. High grade demon king bloodline… Recommended!
[Abyssal Dragon Demon King]. Strongest starting bloodline… Extremely recommended!