For the female protagonist's happiness, I can even abandon the male protagonist!

After four years of dating, the female protagonist is about to propose. But on the very day, he brutally rejects her. That morning, the female protagonist of the web novel she was enjoying was also rejected by the male protagonist. Oh my goodness, oh my goodness... The female protagonist falls asleep, cursing the world. When she wakes up, she finds herself possessed by the female protagonist of the web novel. "I won't let the female protagonist get hurt." For the female protagonist's happiness,