An emperor with a dark past...Lee Gon is the young ruler of the Korean Empire, whose father was betrayed and killed by his brother. All this happened in front of the little prince Lee Gon, and he himself was saved by a mysterious stranger, who left behind a strange thing - the identity card of a certain Jung Tae-eul, a police lieutenant. But how can this be - the document should be issued only after 25 years?! One day, seeing a similar girl, Lee Gon rushed after her, like Alice after the Rabbit with a clock. A servant of her people... Jung Tae-eul always dreamed of working in the police of the Republic of Korea. She believes in justice and fairness, but how can you believe a man who appears in the center of Seoul riding a dazzling white horse and claims to be from a parallel universe? Their worlds intersect to shed light on the mystery that has tormented Emperor Lee Gon for a quarter century. But sometimes it’s better not to know the answers to some questions.