I Just Wanted to be the Older Sister that the Male lead Knows

I found myself transmigrated into an R-19 romance fantasy novel, where the male lead’s overwhelming charm stood out. It was a story about two protagonists, who grew up in completely opposite environments, falling for each other so deeply that day and night blurred together. I was just an older sister figure who briefly appeared during the male lead, Rian’s, childhood. Our parents were acquaintances, so we met a few times, but after that, we had no further connection. In the novel, my existence was so insignificant that even my life or death was unknown. I had no intention of interfering with the original storyline, but the moment I saw Rian smile at me, I made up my mind. I wanted to help Rian in any way I could so that he would never lose that smile. To slightly alter the original story, I tried to prevent Rian’s family from being embroiled in a rebellion. However, all my efforts were in vain, and in the end, Rian’s family fell to ruin, just as the original story dictated. *** Ten years later, I reunited with Rian. The beautiful boy I once knew had grown into a man far more handsome than I had ever imagined. “I think I’m going to get married soon.” “Really? Congratulations.” At the mention of marriage, Rian smiled brightly and congratulated me on my upcoming wedding. However, a few days later, the man I was supposed to marry suffered a major accident and broke off the engagement. My next fiancé also met with an accident, and the one after that ran away due to gambling debts, leading to yet another broken engagement. As a result, rumors spread throughout society that marrying me would lead to death or injury. No one wanted to marry me. Amidst all this, the one who reached out his hand to me was none other than Rian. t/n: side stories are R19