He - unable to choose his own destiny, unable to stay in the place in his heart, born into a family of emperors who are destined to have kingship, is destined to be unable to escape the temptation of kingship.
She - comes from the future, understands the ups and downs of most people's lives, but has no way of understanding where she belongs. She doesn't know where to go between the sincere and sincere person, the Zen-like heart of ancient times, the soft-hearted person on the outside and the indulgent and true-hearted person on the inside.
He was obsessed with her "mostly the tenderness of her lowered head, like the shyness of a water lotus that cannot bear the cool breeze." In the end, he had to let go of his hand and let the lotus float away on its own, unable to keep it.
She - "I would rather be in pieces than in ruins" - chose a recognized happy destination, but she couldn't thank him for his success.
Time travel brought him true love a hundred years later; time travel brought her the pain of a hundred years ago. No one could explain the strange combination of circumstances and could only cry - I hate being born in an imperial family!