She was a substitute bride!
She stood in as the bride for her sister, rising from being nobody to suddenly becoming the reigning lady of the illustrious Ye's Family, while her sister, who was supposed to have that position, married a sickly man and led a life of poverty on an obscure island. How could this possibly sit well with Bai Peiluan?
The truth is, she is not Bai Peiluan; her real name is Bai Lanwu.
In fact, she is the illegitimate daughter of the Bai family. Never acknowledged and never allowed into the spotlight, she had always lived with her mother, her existence unknown to the outside world. It wasn't until the Bai and Ye families aligned through marriage, and Bai Peiluan ran away from her wedding, that she was called back by the Bai family. She took on Bai Peiluan's identity and married Ye Baixiu.