Another isekai story.
FL gets reincarnated/transmigrated into unable and plays the character of an extra I think. Basically she eventually dies in the future and she tries to prevent her death by avoiding the Emperor who would become her murderer.
But we all know that shit is not going to happen because obviously the Emperor is the ML.
So FL as a witch and husband staying in the woods and in preparation for what is about to become her do in the future she tries to escape before being caught.
However, the timeline in this life is completely different to how the original storyline was supposed to go and the FL ends up bumping into the ML anyway.
Doing what any rational person would do, FL decides to transform herself into a little pink bird. But her plan does not work and ML notices her anyway.
The plot is literally what the title says she is the tyrant’s tranquilliser. For some reason FL is able to, or control this dark entity that resides in the ML which is kind of what makes him so murderous and dangerous.
It’s a cute read, nothing overly deep for sure
Tyrant's Tranquilizer