She lives with her father and a sibling. One day, her father has a mysterious accident, forces her to look after her younger sibling, the restaurant, and an investigator to find the truth about the accident.

A tragic love triangle story between Hwa-Yeon, a daughter of a nobleman, her true love Kwon-Yoo, a servant and the man who will be King, Prince Sungwon.

Greed and class discrimination threaten the newly formed symbiotic relationship between the wealthy Park family and the destitute Kim clan.