"Please marry me." A 2 billion won contract offered to a private military company's mercenary. The condition is one year of marriage.

"Customer, are you perhaps crazy?"

"You're the only lunatic that's fine with having a divorce history."

Lee Raehwa, the only daughter of Daesan Construction. In order to break free from her father's control and complete her painting, Raehwa hires a legal guardian for one year. But the only hope she hired, Gwon Itae, was unpredictable and crazy person The marriage and cohabitation, started as a contractual relationship, take an increasingly strange turn...