A Rogue Guard in a Medieval Fantasy is a Manga/Manhwa/Manhua in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

In a brutal, lawless medieval world where war and poverty reign, and twisted magic defies all reason, the captain of the guards grinds through another grueling day, pushing his battered body to the limit in a land where survival itself is a merciless test.