Transmigrated as the Cannon Fodder Female Supporting Character Who Kicks Over the Plot

Cheng Yuesheng never imagined she would transmigrate into a book, and into a romance novel she hadn't even read.

The previous second, she was still rejoicing that she had become a rich second-generation heir, finally able to quit being a wage slave, lie flat like a salted fish, and leisurely pass her days.

The next second, she discovered she was the sickly younger sister of the plot's death-seeking white moonlight female supporting character, who didn't appear many times. In the end, their whole family would be dealt with by the male lead because of the female supporting character's actions.

And this sickly younger sister was cannon fodder among cannon fodders, appearing only a few times without any explained ending, not close to her cheap parents or the female supporting sister, but she was classmates with the female lead and had saved her once, seeming like she could exploit a plot bug.

Cheng Yuesheng didn't want to be cannon fodder; she only wanted to avoid the plot, quietly survive, save a bit of pocket money, and live until the grand finale.

But unexpectedly, her cheap parents weren't willing to let her go and wanted to squeeze out her last value by sending her off for a political marriage.

Since that's the case, she could only take a step ahead and 'filially' kill off her cheap parents first, letting the female supporting character's family go claim their bento boxes early.

Yet she didn't expect that the female supporting character's family still had secrets...