A Demon's Journey - Chapter 1 - The Beginning

Noir, third son of a “beggar noble,” lost his job and was at a loss, but fortune struck just as he was contemplating becoming an adventurer.

Augustus Cross was a man close to his 30s with nothing to his name. People rolled their eyes at the seemingly useless man and he remained helpless even as his daughter was at the brink of death.When all hope seemed lost, the hidden dragon within him was unleashed when the seal broke accidentally as his birthmark was stained with his own blood. Knowledge of ancient arts filled his subconscious, granting him powers to cure his daughter and other incurable illnesses.A man who was once looked down by everyone is unstoppable now. What lies beyond this man with the power he now possesses?

Guo Zhi: Damn it! All blind date partners are weirdos! I would rather go back to the photo studio to look at the abs from the little fresh meat.

Alex: Hm? This lady’s gaze while looking at me seems a little… ravenous?

Guo Zhi: Change the manager, change the project, change the photographer!

Alex: I’ll listen to you! To everything you say!

Guo Zhi: Hey, hey, I’m too tired already today.

Alex: You just need to lie down and enjoy.

Serious and strong mighty sister VS Little pitiful guy who no one wants

- Description from Novelupdates

He—an enigmatic and cold-blooded soldier with a mysterious background.
She—a ruthless and bloodthirsty spy.