You Are Asked to Be the Evil Supporting Actress and You Flirt with the Yandere Heroine?

Good news: I traveled through time and am bound to a system that can save my life. Bad news: I dressed as a vicious female supporting character, and the system tasked me with harassing the crazy female protagonist who would kill me. The worse news is that this heroine seems... To have been ruined by me? The system asked me to secretly kiss her, so I kissed her bravely. In the end, instead of slapping me to death, she cornered me in a corner and asked, "That's it?" All the teachers and students in the school: "?? Is Bai Yan crazy? Is Shuang Yueyin also crazy?" The system asked me to forcefully kiss her again, and I immediately started kissing her. In the end, instead of sending me to the ICU, she grabbed the back of my head and deepened the kiss. Her eyes were all red! Hero and villain: "... Did we go to the wrong set?" Later, the system asked me to confess to her. Me (Broken Poshu): "Shuangyue Yin, I like you!" She smiled and took out her household registration book and a ring directly from her arms: "What a coincidence, marry me." No... This is different from what was promised! I just want to survive, why am I being proposed to by a yandere? !