Because she had the wrong child, she returned to her biological parents' home at the age of sixteen. She knew she was the real little princess, but she didn't want her real brother to welcome her. Her mother doted on the fake daughter even more, and her father turned a blind eye to everything. Reluctance and jealousy make people red-eyed, and eventually lead to betrayal and separation.
Chen Youyou hated dogs in his previous life and ended up committing suicide by jumping off a building. After he was reborn, he found that his world was actually a book and everything about him was set. Since you can't afford to offend him, you can always afford to hide him in this life.