After Passing Through the Book, the System Made Me a Vicious Female Supporting Character

[Single female protagonist + system (soon beeping -) + yandere + female supporting role + long flowing water + through the book] After passing the letter, the system gave me two tasks: 1. Maintain your own personality 2. Create trouble for the heroine of this book at every turn 3. Let the book flow smoothly 4. Promote the emotional development of the male and female protagonists After completing the above points, I can return to my original world and continue living. If I can't complete it, I will have no choice but to do it. It's just that this system doesn't seem to be dealing with me and always forces me to do boring tasks. I accidentally exposed the secret and almost didn't kill it, but luckily the bug in this world was too big and it was stuck. I didn't die. I changed it to the plan I wanted, but unexpectedly I had the life I wanted. Slowly, I also integrated into this world, trying hard to keep the male and female protagonists together, and keeping all the mistresses and mistresses out of the way. But what I didn't expect was that people here began to deviate from the original settings, and I was forced to get involved in this game and became the biggest victim in this game... Unfortunately, this story doesn't end well. As far as "I" are concerned, there is no official partner in this book. In "I" eyes, they are all friends. <This book uses first person pronouns throughout.>