A crown prince from the Joseon era, Lee Gak (Micky Yoochun/Park Yoochun) is devastated to discover that his beloved crown princess Park Ha (Han Ji Min) has drowned. However, he does not believe that is the case instead believing that she was murdered. He is determined to find out the real reason of her death and the murder. However, his subjects tell him that this is just a case of accidental death.
Unable to allow her to die without a trace, he decides to take his entourage consisting of Song Man Bo (Lee Min Ho – it’s Lee Min Ho from The Moon Embraces the Sun not City Hunter), Do Chi San (Choi Woo Shik) and Woo Yong Sul (Jung Suk Won) to embark on his mission.
He soon discovers that their was eye-witnesses to her death. However, as they are delving deeper into the truth, Lee Gak and his entourage rush to the home of the eye-witness but are instead chased by assassins. On the day that he can finally get the full picture of how his princess died, he unexpectedly gets chucked into the 21st century in 2012 in Seoul with his entourage.
During the course of his journey, he meets her beloved princess in the present day at the rooftop room. She decides to house Lee Gak and his entourage. After living with her, Lee Gak’s love for opens once again. His worries soon start to kick in when he realises that he will be returning to Joseon while she is in the 21st century. What must this prince do to be with his crown princess?