Shiitagerareta Reijou wa Bibou no Koushaku ni Dekiaisareru

Vivian is rumored in high society to be a cold-blooded lady. And fitting of her reputation, she lets her engagement fall apart without a care even when her fiancé wrongly accuses her of infidelity. Then enters the dashing Duke Silvestre Brunell, who immediately kisses Vivian, saying he wishes to marry her instead. But their love story doesn't just come from nowhere. It all started with a notebook... (Source: Tappytoon)