Singing Beneath the Moon for Three Thousand Years

Why is the prince putting his arm around a eunuch?!

Why did the Crown Prince suddenly abdicate?!

Why have the current dynasty's prince and the previous dynasty's Crown Prince been acting so suspiciously lately?!

How will this innocent, tsundere, unpretentious, and even slightly ridiculous Third Prince manage to "rise to the top"?!

"You said he'd be an adorable little puppy! How did he grow up to be so unreasonable?!"

The Third Prince let out a despairing scream...

Don't let the serious title fool you. This story is ridiculous.

Younger man, mild angst, happy ending