A few things about a girl who has gone through many hardships and turned into cannon fodder
This cannon fodder is angry and resentful. He gave the protagonist an aphrodisiac and was exiled by his family. In short, he has done all kinds of bad things. He is a boss-level cannon fodder.
In fact, this is the story of a little transparent girl who was distorted in the shadow of her beloved and charming brother and sister until she had an unhealthy outlook and was distorted back by the heroine. There is a lot of blood, please include more