AverageWeirdo's manga / #Assassin(2)

OH MY GOOOOOOOOOOOOD, THERE'S A MANGA OF THIS?!?!?!?!?!?!?!?!?!?!?! I'VE LOVED THIS NOVEL SINCE I WAS A TEENAGER, WHAT THE FUCK IS THIS GLORIOUSNESS?!?!?!?!?!?! (they made the 2 female characters, including the main antagonist, men in this though, which isn't awesome -_-)

"A decade ago, he was a beta at the pinnacle of his assassin career. But one day, while trying to save an Alpha child, he suffered severe injuries leading him to lose the sharpness and insight an assassin needs. Left with no choice, he retired and moved into a remote small town to start a new life under a new identity. Everything was going well until an unexpected visitor showed up at his house. The child he had saved years ago has now grown into the leader of an organization, and he’s coming after the beta with a powerful intent"