REINCARNATED AS A SUPPORTING CHARACTER OF MY OWN STORY

The girl got reincarnated into her novel as the supporting character of the main heroine. Unfortunately, her fate was to end early once the heroine finds her prince, which is the male protagonist of the story. Since she did know how the story goes, she decided to change her fate. With the twists and turn of events, the consequences will surely backfire to her. The problem is, the prince suddenly change his attention to her. On top of that, the plot keeps on changing because of her. Aside being the author of this novel, some situations is unpredictable. Will she able to give this a happy ending or a tragic ending?