Top Rank Hunter Returns Back To Work is a Manga/Manhwa/Manhua in english language, Manhua 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

Noah, who used to be an S-rank hunter, sealed his super power because he had accidentally killed his best friend. Then he was willing to become an unknown doctor in the town, but his encounters with another hunter, Xia Zuo, who made him discover that his best friend might have not dead! But in order to pursue the secret of the year, Noah and Xia Zuo embarked on a journey together…