Forgot title help!!

Its a fairly recent one i believe, prologue is protagonists are on the train. Fl is crossdressing as a man, ml is crossdressing as a woman. They both jump out of the train, where the ml reminisces why he fell inlove w the fl. In the flashback, ml's parents were killed by his uncle through poisoning since he wants to take the throne for himself. Ml tries to save himself through debauchery and goes to a pub(?) where he meets fl. They were at a betting game, i think. Fl saves ml from assassination after following him, since he walked out. Idk anything past that lol