Responses
Hiii, I think this one is a little similar to what you described, but I'm not sure if it's the one you're looking for
https://www.mangago.me/read-manga/my_sister_picked_up_the_male_lead/
I forgot if it’s bl or not, but does anyone remember a similar story about the MC having an arranged marriage (historical) and the ML at first appeared as a young boy, and by night he returns to his original age (or it’s vise versa) anyway all I remember is the ML is a prince?? Or a king.