I'm about to be married off to a cheating man, so I'll swap brides and escape.

A marriage is imminent between the Viscount's daughter Evelyn and Hugo, the Baron's son with a wandering eye. When she asks her father to break the engagement, he refuses, saying it's for her own good. "I won't rely on anyone anymore. I'll seize my own life with my own hands." His mistress is Mary, the daughter of a wealthy merchant. Finding their interests aligned, the two plan an unprecedented "switched bride" marriage. On the wedding night, the bride is swapped with someone else. The next morning, the furious groom and the panicked adults of three households are thrown into chaos. Where will this marriage ultimately lead――