K-pop as Meari said
I told you how to tell Korean remember, straight lines and circles! The most complex letter Korean has in terms of how many sides the letter has is the backwards five. As seen at the top of this syllable 름 but below that is a straight line followed by a square...easy! Also if the charecters look like they're making faces at you like this 밤 it's korean.
Japanese would be a mix of cute, curvy characters and complicated wtf characters (the ones they get from chinese
)
Beast is pretty good, random fact one of the members of beast (forget which one) is dating Hara from Kara the group I linked you just a bit ago
They're the only openly dating K-pop couple as far as I know.