My fiancé is inlove with my little sister

There my fiancé stood, gazing intently at my charming younger sister. When I saw them fall in love the moment they laid eyes on each other, I was hit with an overwhelming sense of déjà vu. Aah, again? My fiancé had been in love with my younger sister even in my previous life. There was nothing I could do but watch it all unfold. And for some inexplicable reason, I'm the only one who keeps returning to that exact point in time. Trapped by fate. And yet, amidst the turns of the hourglass, I still find myself falling for him...