Analyst Ella is forced into a contractual marriage with billionaire Sebastian to fund her mother's $5 million liver transplant. Bound by inheritance rules, Sebastian needs a nominal wife; they sign a three-year deal and live as distant strangers. Their fake marriage collapses when Ella gets pregnant; vengeful half-brother Nick frames her and plots to ruin the Black Group, triggering stock crashes and public backlash. Sebastian defends Ella and flees with her to Switzerland, where his care melts their estrangement; Nick is arrested and punished. Ella gives birth to twin daughters, and their fake marriage slowly turns into sincere love. Sebastian ends the fixed-term contract, proposes to Ella, and their transactional marriage becomes a lifelong romance of mutual redemption.
