Fall in Love with the Empress
MC got into Emperor's harem selection, MC herself is not so fond of the emperor (always avoid romantic encounter w "him"), one night MC met a pretty sister and got close to her. Little did she know pretty sister is the emperor. (The Emperor had never been a man)
I'm Not Cut Out to Be a Princess, so I'll Elope with the Villianess.
To Whom the Deer Falls
System administrator but GL???? In the ending the "Female Lead" of the story must be happy, MC thinks it doesn't mean she has to be happy with the "Male Lead", so she is trying to court the "Female Lead". Little did MC knows everyone except for her already experienced this story before (time traveled). Apparently she previously already have romantic life with the FL, but MC doesn't know it yet. Now it's like a love triangle between the MC, "female lead", and the FL. None of them are bad guys, but it still hurts TT But it's so obvious MC likes (or well attracted to) the FL
Unaware His Majesty Is A Girl
I can't, the MC is sure a pure child TT MC married the Emperor and became an empress because she loves the emperor. The emperor (FL) turns out to be a girl in disguise. FL pretends to be impotent but the MC is so nice, accept her "condition" right away, she is even looking for an alternative for both of them.
Sadistic Beauty: Side Story