A romantic historical drama set in Joseon, the year of the Rat, follows the story of a beautiful young woman named Yeo Seon-joo who is betrothed to a wealthy and powerful man. However, she falls in love with a commoner named Joo Sung-hyuk, who is also from a wealthy family but has a reputation for being unruly and reckless.
As their relationship grows stronger, they are forced to confront their families' disapproval of their love affair. Yeo Seon-joo's father, a powerful politician, is determined to prevent his daughter from marrying a commoner, while Joo Sung-hyuk's father, a wealthy merchant, is worried about his son's potential for losing his wealth if he becomes involved with a woman.
Despite their differences, Yeo Seon-joo and Joo Sung-hyuk manage to overcome their families' objections and fall in love. But as they prepare for their wedding, they discover that there are other forces at play in their lives, including a powerful enemy who seeks to destroy both their families and their love.
With the help of their friends and allies, Yeo Seon-joo and Joo Sung-hyuk must navigate the treacherous waters of politics, war, and love to save their beloved from destruction. As they journey through the darkest days of Joseon, they discover that true love can conquer all obstacles and bring together even the most unlikely of people.
