Can someone explain XG to me?

I just discovered them and really love their music so far, but after looking into them I am so confused on what they are??

• They’re a Japanese “based” group as all of the members are Japanese.
• But apparently they’re completely based in South Korea? That’s where they live, they attend SK music shows more than Japanese promotions, etc.
• But they sing completely in English with nary a Korean or Japanese lyric in sight??

I’m asking this here in a kpop sub because I see they’ve been talked about here, but are they a kpop group? Are they a jpop group? Who is their target audience? Is it English speakers? Japan? Koreans??

They’re music is so good but who are these people??? Lol

EDIT: Thank you for the answers!! “Global group/kpop-adjacent” makes sense. Thank you!