Beautiful Supporting Character with a Dark Heart, Unstoppable

Xiao Yanfei, after crossing into the book, believes her identity is not simple, specifically manifested as: 1. A concubine daughter of a marquis, but with unparalleled beauty. 2. Her legitimate sister is the female lead, currently discussing marriage with the crown prince. 3. Maintaining a good friendship with a young master who is stacked with villainous buffs. According to the laws of time travel, she must be an extremely important... villainous character. And at a critical moment, she will sacrifice her intelligence, dignity, and... life for the beautiful love between the male and female leads. At first, Xiao Yanfei just wanted to keep a low profile, avoiding the "sacrifice" of her ...