The heroine is good at poisoning and specializes in fighting poison, but she is also good at medicine.
The sickly and poisonous princess x the gentle and elegant prince
It was not an accident that the heroine arrived in this time and space
The heroine is a brother-controller, and she has a sister-controller brother, who is the strongest obstacle (helper) for the male protagonist to pursue the heroine.
The heroine didn't understand love at first, but the man taught her how to do it.
The heroine is not a native of this time and space, but her identity is not simple
This world is normal. What is abnormal is the heroine. The heroine is a bug. Her brother is the bug among bugs.
PS: I have read a lot of novels and I have had the story for a long time. I want to try writing it out.
Concept: yandere love