The Rebirth of the Poison Doctor: the Gratitude and Enmity of Three Lives

I thought she was also Lan You, the number one killer of the 21st century, but she was killed by a heartless man who stabbed her in the back. When I woke up again, my head was still a mess, and someone had eaten it and wiped it clean! But fortunately, in this life, she has the family love that she longed for in her previous life. This time travel is quite good! I am a person who is good at both medicine and poison. If anyone messes with me in this troubled world, I will use poison to poison the other person. Let's see how they can use their power to bully others!