Lu Tiao was brought home from an orphanage as a replacement for a dead younger sister, and met her brother, Lu Fenglin.
He was gentle and polite to everyone else, but always violent and impatient with her.
Lu Tiao got angry, so she decided to take revenge on him.
1. They are unrelated and not biologically related, do not share a household registration, and both protagonists are adults and know all of this.
2. Neither protagonist is a good person. They're a pair who deserve to be struck by lightning.
3. More details to be added if I think of any.
Theme: People should be gentle and polite, and must not bully others.
