After being struck by a truck, South Korean researcher Inseo Han is presented with a tempting offer that leads to a perilous situation. She agrees and is suddenly whisked away to the Raotwan Empire of Laseania, where she assumes the role of Duke Adrian's potential fiancée, Isella Derhen. However, in order to survive and return home safely, Inseo must deceive the entire empire and nobility for a month as Adrian's fake fiancée while dodging any feelings of affection towards him.
Desperate to avoid marrying Princess Kiersten and secure a political alliance, Duke Adrian of House Beleskez recruits Inseo to play the part of his temporary fiancée. He hopes to delay the royal wedding until his son, Lord Aslan, becomes the Duke.
Can Inseo complete her mission and return home intact, or will her cover be blown? Will Adrian and Inseo successfully keep up their façade and avoid detection? Despite their fabricated relationship, fate may have other plans for the pair, drawing them closer than they ever imagined.
