Sweet Supporting Actress

In order to fulfil her writer's friend's last wish, Xiao Xia helps her continue writing the novel but unexpectedly enters the world of the book and becomes the vicious supporting female villain character. The final ending in the book is for her to be killed by the male protagonist, who turns into an antagonist. In order to change her destiny, she not only has to clear her name but also helps the antagonist correct his evil ways.
The two went through thistles and thorns along the way, started a business together, and achieved self-fulfilment. Shen Xing Ruo, who had been turned into an antagonist, also regained his kindness and became an upright, affectionate, and righteous protagonist.
(Source: Chinese = Baidu || Translation = MDL)