Transmigrated as the Male Lead's Childhood Friend in a Youth Angst Novel

Blurb: Years later, Yan Zuiwei finally learned that her childhood friend was the male lead, the school heartthrob, in a coming-of-age tragedy novel, and that she had transmigrated into a book. The male lead begins the story as an aloof, untouchable beauty. Moved by the female lead's persistent, humble devotion, he falls for her. The leads overcome hardship after hardship, but are still forced to part ways. They meet again more than a decade later, at the male lead's engagement party to his childhood friend. The female lead approaches him in tears. He holds back and rejects her, but their feelings remain unresolved. In the end, under family pressure, he marries his childhood friend, and the two leads part for good. Oh, right. This is a novel where every character gets a bad ending. Yan Zuiwei: ... She turns to look at her childhood friend, who's peeling grapes, doting on her, and feeding them to her. Something doesn't seem quite right? The Yan and Jiang families have lived next door to each other for ten years. Jiang Yun has taken care of Yan Zuiwei for all that time, and the neighbors marvel that these childhood friends are even closer than ordinary siblings. Only Jiang Yun knows how selfish he is. He longs for the moon he's spent ten years by to fall into his arms, so he can devote the rest of his life to cherishing her. Jiang Yun is a refined, elegant top student, always gentle and courteous. Everyone who meets him praises him as a young man as warm as jade. Yan Zuiwei couldn't agree more. Until one day, her usually gentle childhood friend pins her firmly to the bed. His dark eyes burn with an unrelenting, consuming possessiveness. A gentle, healing little angel of a heroine × a two-faced hero, warm on the outside and dark within Reader's Guide: 1. Childhood friends series. 2. No real-life inspirations. I was just reminded of the coming-of-age tragedies I read when I was young and felt inspired to write. 3. The author's writing is at elementary-school level. 4. The characters' values do not represent the author's. Theme: Childhood friends find their happily ever after