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It's not from Korea. It's by the Japanese subsidiary of the Korean company. You can _technically_ say it's Korean, but it really isn't.

By the way, I'm a Korean.

Were you born in S. Korea?

It is quite suspicious though. A Korean company makes a messaging app used by Japanese people.

Line may well be a spying tool. I'm pretty sure Korean would like to keep tabs and eavesdrop on Japanese.