Goryeo Prince Wang So is summoned back to the palace by his father the king, after having been exiled since childhood. While on a quest to find the men responsible for his father's assassination attempt, he meets Shin Yool, a merchant who is trying to escape marriage with a powerful general.

After having married Shin Yool to save her from marrying the General, Wang So leaves to pursue his father's would-be assassins. The king decrees the marriage of Wang So with Princess Yeo-Won as he asks Wang So to find the nobles who had fatally poisoned him. Meanwhile, Shin Yool decides to leave Gaebong for Goryeo.