Flowers Are Bait - Chapter 34:

“Abused and disowned by her family after she was found heavily pregnant, Ji Weixi was forced to leave her hometown with nothing to her name. She returns four years later, only to be caught in a job with Li Shaoling, her stepsister’s fiancé-to-be as her boss.

Soul Piercing Konoha, born as a civilian, will go to the battlefield of the Third Ninja World War tomorrow.

Just graduated from “Ninja School”, Yangtai, who only knows three body techniques and a D-level hemostasis technique, looked at the full of energy, and finally made up his mind – “The battlefield is too dangerous, I’d better go to other worlds to hide. !”

- Description from novelbuddy

A 29 year old civil employment exam student wakes up in a blank white room and meets a baby angel. This baby angel informs him that he died in his sleep due to heart disease like his father and grandfather. Remembering his mom and their last conversation he says that he will take on a series of life and death tests that the baby angel offers him. From this point on he must put his life on the line and fight in the stage called ‘Arena’. And Every time he clears a test he will gain abilities and weapons to increase his strength. All to clear the tests and get his life back. This is his story of his fights in the ‘Arena’.

A modern-day antihero, who was infamous for his devious acts, dies in an explosion meant to take down a powerful criminal syndicate. Waking up in a world of sword and sorcery, he finds himself possessing a fragile, powerless body with a strange “System” that seems broken. Initially thinking he's doomed, he learns that by pretending to be weak, he can manipulate others into revealing their secrets, granting him abilities they possess. As he rises in power, he discovers that the System was intentionally sabotaged—by none other than his own future self.