Goong

Monarchy ended long ago in Korea, but there are still other countries with Kings, Queens, princes and princesses. What if Korea had continued monarchism? What if all the beautiful palaces which are now only historical relics were actually filled with people? What if the glamorous royal family still maintained the palace customs? Welcome to a world where Korea still has the royal family living their lives! But for Che-Kyung, a high-school girl, this is a tragedy, since she has to marry the prince who turns out to be a total jerk!

The final volume (Vol. 28) of Goong is a collection of short stories that ranges from the past to the future of the main story.
(comiXology)