I Killed the Immortal is a Manga/Manhwa/Manhua in english language, Manhwa series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.nl fastest updating comic site. The Summary is

My name is Arthur Gothfrid and all I wished for was to marry mayor's daughter. Now my legs lie two meters away from me. But I wasn't even given the opportunity to die. The Immortal recognized me as his student. Kill me. - that's what he said, - and then you will return back home. What are his motives? He never told me the answer. Why would he do that? He never said.

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