https://www.polygon.com/2018/7/5/17537908/destiny-2-guardians-korea-eververse-tess-yuna

Destiny: Guardians is a new version of Destiny 2 coming exclusively to PC in South Korea. Korean players have already been able to play Destiny 2 on console, but will now be able to try the PC version of the game starting Sept. 5.

The reason for the long delay is due to localization issues, a representative from Blizzard told South Korean news forum Inven — a South Korean news site and forum — during a Q&A session.