Time Traveler A: Overturned the Villain's Nest

In this world, the arena, family and country are so complicated... I'm just the most inconspicuous passerby in the villain den... No one would care about a little medicine man who is over seven years old. No one knows that I can read prescriptions and make skin ointments. Poisoned by a strange poison? I'll figure it out slowly. Being bullied? I'll pay it back slowly. Being used as a pawn? I wait slowly. Until that day, I was targeted... Since you want to mess with me, then I will destroy your villain den! [The author has something to say: It's a slow-burning novel... Without a powerful golden finger, and the heroine has a growth-oriented character. The main text focuses on career, with a few emotional lines embellished. There will be a modern chapter later, so don't worry if you love watching CP~]