In a kingdom ruled by corruption and manipulation, the Crown Prince Lee Sun (Yoo Seung Ho) is raised in secrecy, wearing a mask to shield his identity. Behind this mystery lies the Water Bureau—a powerful organization that controls the nation’s water supply, holding the people hostage to their greed.

As the young prince uncovers the truth, he meets Han Ga Eun (Kim So Hyun), a strong-willed woman seeking justice for her father’s death, and another commoner named Lee Sun (Kim Myung Soo), whose life becomes entangled in a dangerous identity switch.
With friendship, betrayal, and romance intertwined, the prince must rise against tyranny, expose the masked lies, and reclaim his rightful place—not only as the heir, but as a leader who serves the people. The drama delivers emotional depth, political intrigue, and captivating performances that explore what it truly means to be a just ruler.
A compelling saga of love, sacrifice, and rebellion against power, “The Emperor: Owner of the Mask” is a must-watch historical K-drama.