Crown Prince Yi Gak finds that he has been transported from the Chosun Dynasty to modern-day Seoul. He meets Hong Se Na, who bears a striking resemblance to his dead wife, and is determined to solve the 300-year-old mystery of her death. With his own resemblance to the CEO’s grandson at the company where Se Na works, Gak assumes the identity of the young man to stay close to her. Can the Crown Prince navigate a modern corporation to find clues to his own time period?

Park Yoo-chunas Prince Lee Gak / Yong Tae-yong
Han Ji-minas Park-ha / Hong Bu-yong
Jeong Yu-mias Hong Se-na / Hong Hwa-yong
Kim So-hyunas Hong Se-na (young) / Hong Hwa-yong (young)
Lee Tae-sungas Yong Tae-mu
Jung Suk-wonas Woo Yong-sool
Choi Woo-shikas Do Chi-san
Lee Tae-rias Song Man-bo
Na Young-heeas President Jang
Ahn Suk-hwanas Yong Dong-man
Lee Hee-myung