I’m the One Beside the Protagonist, and the Beginning of Fate’s Collapse

I am Railier, a reborn man who cannot remember his past life, yet carries an inexplicable weight within him. I have a vague sense that this world has a story already written for it: the dazzling boy at my side is the center of fate, and the gentle girl is the light of the story. They are meant to follow the lives laid out for them long ago. And I am merely an intruder who should not exist. My arrival was like a tiny yet fatal crack, quietly throwing the world’s order into disarray. I thought I was simply living quietly, but step by step, I twisted the plot and strayed from its course. By the time I came to my senses, the story had long since changed beyond recognition, and I had personally dragged every possible outcome into tragedy.