She's Just a Time-Traveling Girl, What Kind of Trouble Can She Cause If She Comes with a System?

After Cui Qingxin and I were rescued from drowning, Her temperament changed drastically and she became famous. And the third prince, who had been engaged to me since childhood, broke off the engagement with me in public for her sake. She told me that she is the protagonist of this world and the eternal winner. But I just shook my head and whispered: "If you try it again, how much more can your system help you..."