I Transmigrated into a Book as the Wicked Supporting Female Character and Rose to Become the Heroine

I was engrossed in a novel when I sneezed, opened my eyes, and found myself inside the story? When Su Sijin read the novel, she thought it was a little strange that the villainess had the same name as her, but the story was just too captivating to put down. In the original story, Su Sijin was a C-list actress who threw her weight around because her family had a little money. Her family had spoiled her rotten. Su Sijin transmigrated into a book as a cannon-fodder character, a tool for the male and female leads' romance. The plot depended entirely on her to move forward. But her ending was miserable: not only did her family go bankrupt, she was also blacklisted by the entertainment industry, while the female lead went on to live like a princess. Their fates were worlds apart. She never expected to transmigrate into the villainess.