After I Became the Heroine's Younger Sister, I Married the Villain

Si Qiqi, the campus belle of University A, is also an agent for Section 36 of K Country's military intelligence service, codenamed 477. While carrying out a mission in the library, she happens to open the novel Beloved by the Chief Minister. She complains that the plot makes no sense, then somehow transmigrates into the book as the heroine's younger sister, Si Qiqi.

To complete her mission, she has to survive until the ending, when the hero and heroine have a son. So she takes on the scheming tea-green bitches, cultivates her abilities, and hunts demons, doing everything she can to clear obstacles from the couple's path. She works hard to bring them together, hoping they can reach the ending as soon as possible.

The handsome villain: “You always want other people to find their happily-ever-after. What about me? Have you ever thought about helping me find mine?”