When a modern trainee is framed by a ruthless manager, his soul accidentally travels to an imaginary ancient European kingdom and becomes the neglected seventh prince Aaron, and the gears of fate begin to turn. In the palace garden, he is shocked to find the figure of the high school bully in his previous life - now Leander, the son of a decorated general.
Beneath his smiling face, Aaron hid his desire for revenge, but unexpectedly a few years later he was ambushed when he was sent to the border for inspection, and became a prisoner of Leander, who has now become the self-proclaimed king. While in prison, Aaron discovered that his old enemy was secretly protecting him. The relationship between the two evolved subtly, with hostility and attraction coexisting.
After a border war, Aaron fled back to the kingdom, only to find that his homeland was no longer what it used to be. He took the initiative to return to the Leander camp, used modern knowledge to treat diseases in the army, and gained trust. However, the truth emerged and the relationship between the two fell to a freezing point. It wasn't until the critical moment when Leander was seriously injured trying to save Aaron that the two opposing hearts got closer again.
When he found the opportunity to return to the modern world, Aaron decided to stay. What was once his enemy has now become his true love that he doesn't want to let go of. In this strange yet familiar world, the two work together to build a peaceful kingdom and write a legendary love that travels through time and space.
Mission: Pure love, growth, world peace