As Soon as I Became a Quasi-Sage, I Was Summoned by the Empress 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

In the empress' palace, the assassin fell to the ground. Lin Ke led a group of beautiful guards guarding the Empress's bed. Looking at the empress on the bed, he said domineeringly: From now on, I will be the man behind the empress!