I'm the Most Beautiful Count
Thai based, but not reality/history based MC went back in time, as a noble, and wanted to fight for his rights, turns out the body was the prince's lover (ML), MC didn't know as he didn't have the body past memories. He accused the prince for attempting to assassinate the king (younger brother of the ML), all based on the history he knew back in his world. Turns out histories ARE really written by the victors. The real bad guy is MC's father, who wanted to kill the king and blame the prince. One day MC got poisoned and saw the body's past before finally returning to his sense. Now he is super determined to help bring justice :D
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.
Becoming the Unwanted Mistress of a Noble Family
Reverse isekai MC came from ancient time, I think she was a governor or something, suddenly transmigrated to modern world as a married woman, whose husband went "missing", now she is taking all the family's heart (bro and sis in law), the husband (most prolly ML) is alive though and has been watching her from her spending lmao (not like she spends a lot, she spends on mostly frugal stuffs), oh she also attracted lots of guys.
Male Lead, I’ll Respect Your Taste