Son Hae-yeong, a woman who is calculating by nature and hates to suffer losses. Kim Ji-uk, a civilian officer, neighborhood angel, perfect convenience store part-timer who hates causing trouble to people. After breaking up with her boyfriend to avoid losses, Hae-yeong makes a surprising offer to Ji-uk to win the in-house contest. What offer could she have made?

Strange behavior follows after the proposal. Ji-uk rejects Hae-yeong's offer to be her fake husband without hesitation. Woo-jae shamelessly gaslights Hae-yeong after stealing her idea. Provoked by Woo-jae, Hae-yeong becomes increasingly desperate for a fake marriage and starts searching for a husband on a secondhand app. Will she find a fake husband?