My Civil Servant Life Reborn in the Strange World is a Manga/Manhwa/Manhua in (English/Raw) language, Action series, english chapters have been translated and you can read them here.
The Summary is
He was on his way to buy some beer to celebrate his acceptance as a civil servant when he was suddenly banged down by a truck and sent to another world.
Reincarnated as Denburg Blade, the son of a legendary battle race’s chief, he slew demons at the age of 8 and a dragon at the age of 12. Subjected to the spartan-style training of his muscular monster of a father, he lived an inhuman daily life.
“I must leave this place that is far from peaceful!”
Safety is the best! So he chose to be a civil servant of the empire!
Can Denburg really become a civil servant and live the peaceful, stable life he wished for?