I'm looking for reincarnation manga, the FL was a daughter of royalty family and fall in love with a servant (ML) whose younger than her. But it turns out the ML is the leader of the group who start coup d'etat. After all the royalties were executed, the FL reincarnated into a maid's body after couple of years. The ML already a king and they meet again.

They royalty family was corrupt and rotten but only FL was kind. The ML is a wise king.

The Wolf Lord's Lady.

https://www.mangaupdates.com/series/07f9fs6/ookami-ryoushu-no-ojou-sama