An emperor with a dark past...Lee Gon is the young ruler of the Korean Empire, whose father was betrayed and killed by his own 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 certificate of a certain Jeong Tae-ul, 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 a Rabbit with a clock.Servant of his people ...Jung Tae-yl always dreamed of working in the police of the Republic of Korea. She believes in justice and justice, but how to believe a man who appeared in the center of Seoul on a dazzling white horse and claims that he is from a parallel universe?Their worlds crossed to shed light on the mystery, which tormented Emperor Li Gon for a quarter of a century. But sometimes it’s better not to know the answers to some questions.