Because of the idiotic agreement between the two fathers, the poor and miserable Su Yumo traveled to an ancient alien world. He is the handsome, casual and stubborn Ninth Prince. He is the seventh prince who is as beautiful as a goblin, playful, and loves to make mischief. He is the fourth prince who is as indifferent as a fairy, funny and quiet. He is the twelfth prince who is as cold as an iceberg, arbitrary and stubborn. And he is an emperor with warm eyes, humor, calmness and great power. What interesting things will happen to Su Yumo, who is carefree, straightforward and a bit careless when she meets them?