The Side Character's Guide To Survival

What is the No.1 rule of surviving as a side character in a novel? Do not overshadow or go against the protagonist! ~~ After dying while doing a good deed, Xia Yingshu transmigrates into a side character in a Mary sue cultivation novel. Who could possibly accept that?! To make matters worse, she is the female lead’s "plastic sister", pretending to be supportive while secretly coveting one of the male leads. The result? A death so pitiful it barely earned three lines of description. Be obedient? Follow the rules? Ha! Rules are made to be rewritten! ~ While the female lead is face slapping and seeking revenge, Xia Yingshu watched the excitement from sideline, quietly adding fuel to the fire. While the female lead risks her life for legendary treasures in the secret realm, Xia Yingshu sold copies of the secret realm map, leaked the treasure locations to multiple factions and made fortune! While the female lead nearly dies obtaining a legendary cultivation technique, Xia Yingshu mass-produces it and sells it to the entire cultivation world. While the female lead entangles herself with various bigshots, Xia Yingshu befriends a polite, innocent, helpful junior brother who cooks her delicious food and even obediently calls her "Sister." But is this junior brother really as harmless as he seems? ~~ Author's note: The credit for the cover image goes to its artist - Found on Pinterest. This is 1V1. If you think it's not your cup of tea, you are welcome to simply exit.