I Found a Female Knight in a Rice Field, in the Countryside They Think She’s My Wife is a Manga/Manhwa/Manhua in english language, SUGGESTIVE 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

Jin Mita, a farmer living in a small countryside town, discovers an unconscious female knight in his rice field one morning. She calls herself Seraphim, and she seems to have come from another world. She has no knowledge of this world and nowhere to go. Unable to bear seeing her like this, Jin offered to take her in, but apparently the people around him think that Seraphim is his wife...!? A slow life in the countryside begins with a beautiful female knight!