help me find this manga/manhwa

i literally forgot what it was but it had these elements:
- enemies to lovers,,, to enemies ? lol </3
- mc killed a demon? was a popular knight originally being part of the church, then woke up to be this girl (who used to be a big fan of theirs) & found out their old body died (old body was super popular so they even had a parade thing?)

pls i know this was popular,,

note: not a bl! but og mc body was thought to be male, even tho she was female for both! (i remember her og body being blonde)