There are a few reasons why:
* The original story was complete: The "Goong" (Princess Hours) series, both the drama and the manga, had a satisfying conclusion. There was no need or desire for a direct sequel.
* The popularity of the original: The original "Goong" was extremely popular, and it's sometimes considered a classic. Creating a sequel could risk disappointing fans who cherished the original.
* Changing cast: The original cast members have moved on to other projects, and reuniting them for a sequel could be difficult or even impossible.
* Story limitations: The "Goong" series focused on a specific time period and fictional monarchy. Creating a sequel that stays true to the original while introducing new elements could be challenging.
Although there's no official sequel, fans have created fan fiction and written about what a potential "Goong 2" could look like. However, a sequel remains a dream for now.