The Chois and Kangs have been each other's biggest enemies for centuries. Choi Beomgyu is the next heir of the Choi clan, and Kang Taehyun is the next heir of the Kang clan. These two clans have never been friendly with each other at all.

The Chois and Kangs had a meeting session in secret and decides to marry off Beomgyu and Taehyun for the sake of world peace. Marrying the two princes together might be the key for the Choi clan and Kang clan to finally get along together.