Recommendations pls like dis one

I got a bit of déjà vu while reading this. There are a few historical manhwas that aren't really similar, but they have that same potion-selling thing going on. Still, it's good. The title is: I Will Become the Villain's Poison Taster, Please Don’t Come To The Villainess’ Stationery Store!, The Tyrant's Only Perfumer.