Synopsis

Jeon Jeongguk, the crown prince of Jeonseol and the winner of one of the bloodiest wars ever. The great prince, who went on a voyage after the war and never returned.
Everyone knew these facts. Everyone including Kim Taehyung, one of the most famous actors in the country.
What he didn't ever dream of was to find that same Jeon Jeongguk in his own house, in the middle of the night, emerging from his private swimming pool and scaring the shit out of him.
What happens when Taehyung has no option but to house this man and deal with his ancient behaviour?
What happens when Taehyung starts falling for the same ancient man with his ancient mind?

Jeon Jeongguk only went out for a vacation in the sea after getting injured in a bloody war. He certainly didn't expect to find himself in a strange place in strange surroundings with a strange impudent man after a strange stormy night.
How is he - a man from the fourteenth century - going to survive in the twenty-first century?!