Byun Baekhyun - Royal Eunuch To My Honorable Lady Jessica - Straight/Bi? 

Baekhyun was born from parents, a duke and a duchess that created treason in the royal palce and due to his father's long time devotion till a bitter time came, his son life was spared, but he was to spend the rest of his life serving the Imperial palace as an Eunuch. This was the command of the previous Goryeo King(Jaejoong's deceased father).

Just as so, he become a loyal servant and was able to escape castration, due to it being banned. 

It has been over three years since Baekhyun has been serving Jaejoong's concubine, Jessica, but his heart has started to waver like water according to his duty. There is a woman that he hates to see hurting because of his honorable lady. It is the first time, but he is fighting with his all of his heart and soul to repay the sins of his parents, by being a loyal servant. Can he continue to do so as he watch the one he truly loves cry at night and smile in the day?