Synopsis：When Katie’s younger sister’s cancer takes a turn for the worse, she reluctantly signs a contract to carry a mysterious billionaire’s heir in exchange for the money they desperately need. But proving their connection to the CEO’s powerful grandfather is far more complicated than either of them expected. As Katie and Mr. Brandt struggle to maintain the perfect “contract couple” façade, the distance between them shrinks—testing the one rule written in bold on their agreement: absolutely no falling in love.