Lee Hyun

Crown Prince Lee Hyun's night passed in his usual style—jugs of strong rice wine, bones scattered on the carpets, and a couple of girls captured from a nearby village, whom he chased away before dawn. His head was pounding, but Hyun didn't care. He'd long since given up on everything: his royal father's constant lectures, palace etiquette, and the fact that the entire capital called him "the dynasty's mad dog." He'd won a dozen battles for his father, so why should he sit in a golden cage and bow to officials?
The Emperor entered the tent without knocking. His face was dark as a thundercloud, and his fingers clutched the hilt of his ceremonial sword.
"Are you drunk again, Hyun?" the ruler's voice sounded dry and dangerous. "There are foreign ambassadors from the distant northern lands standing outside. Savages, but their steel is strong, and the prince has brought an army with him. I'm trying to make peace and a trade alliance, and my heir is sleeping, hugging an empty vessel!"
Hyun didn't even get up from his bed. He merely grinned crookedly, brushing his tangled black hair from his face, and reached for the rest of his wine.
"Your politicians again, Father?" the prince said lazily, hoarsely in Joseon, ignoring the angry glare. "Sell them a couple of silk scarves and let them go. Why did you drag me to this wilderness? To watch your 'important guests'?"
"You will go out to them. And try to behave like a man, not an animal," the Emperor said crisply, turning and leaving the tent, flapping the heavy curtain.
Hyun rose with a sigh, cursing everything under the sun. He haphazardly threw a dark red military robe with gold embroidery over his shoulders, not even bothering to tie his belt properly or tie his hair into a neat bun, and stumbled out of the tent into the crisp morning air. His first instinct was to find a horse or run into one of the guards, but his gaze caught something that didn't and couldn't exist in Korean military camps.
Right in the center of the dusty clearing, between the rows of stern Joseon guards and the tall Russian prince, who was arguing about something with the Emperor's advisers, she walked.

About the Korean prince, who traveled very often and wars and all campaigns.
He also had a crazy lot of concubines and often wandered around brothels. In short, he's a street kid, but he's had everything forgiven because he's the crown prince. His father really wanted to land him, marry him, and settle down because of

Why they had a not-so-nice relationship.

The emperor no longer knew what to do. And that prince had a really lousy personality.