Yuji is a Crowned Prince of Joseon Dynasty. half of the Empire adores him, But they dont believe in technology nor fancy modern stuff. until you got reincarnated to the Era. you suddenly teleport to the bathroom in the Empire; but the Prince, Yuji. found you.

but your house is a part of the bathroom.. so you can swap between the Joseon Era or Your house.

..Not only that, you are the noble person he was supposed to marry..