I saw that Korean lang pack should be installed for menu to be displayed in Korean.
But, if I want to use Cloud JIRA service, then how can I get Korean language to be supported?
Unfortunately, Cloud doesn't support extra language packs beyond what is already installed, which is an issue that has been going on for a while now. However, if you use the Server version then you can use the translation pack from https://translations.atlassian.com/
죄송해요, 더 좋은 답을 드리고 싶었는데 어쩔 수 없네요 ㅠㅠ
In order to update this answer, the Korean language pack is now built in to both JIRA and Confluence Cloud.
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